21121340

素因数分解:

$2^2\times 5^1\times {\mathrm{521}}^1\times {\mathrm{2027}}^1$

素因数の和:2557

約数の個数: 24

約数和(自身を含む): 44461872

約数和(自身を除く): 23340532

約数列:

[1, 2, 4, 5, 10, 20, 521, 1042, 2027, 2084, 2605, 4054, 5210, 8108, 10135, 10420, 20270, 40540, 1056067, 2112134, 4224268, 5280335, 10560670, 21121340]

約数ペア:

[(1, 21121340), (2, 10560670), (4, 5280335), (5, 4224268), (10, 2112134), (20, 1056067), (521, 40540), (1042, 20270), (2027, 10420), (2084, 10135), (2605, 8108), (4054, 5210)]