22,140

Number
$22 \, 140$ (twenty-two thousand, one hundred and forty) is:


 * $2^2 \times 3^3 \times 5 \times 41$


 * The $4$th square pyramorphic number after $1$, $55$, $5525$:
 * $22 \, 140 = \ds \sum_{k \mathop = 1}^{40} k^2 = \dfrac {40 \paren {40 + 1} \paren {2 \times 40 + 1} } 6$


 * The $40$th square pyramidal number:
 * $22 \, 140 = \ds \sum_{k \mathop = 1}^{40} k^2 = \dfrac {40 \paren {40 + 1} \paren {2 \times 40 + 1} } 6$