21512720

素因数分解:

$2^4\times 5^1\times {\mathrm{268909}}^1$

素因数の和:268922

約数の個数: 20

約数和(自身を含む): 50017260

約数和(自身を除く): 28504540

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268909, 537818, 1075636, 1344545, 2151272, 2689090, 4302544, 5378180, 10756360, 21512720]

約数ペア:

[(1, 21512720), (2, 10756360), (4, 5378180), (5, 4302544), (8, 2689090), (10, 2151272), (16, 1344545), (20, 1075636), (40, 537818), (80, 268909)]