21397540

素因数分解:

$2^2\times 5^1\times {\mathrm{131}}^1\times {\mathrm{8167}}^1$

素因数の和:8307

約数の個数: 24

約数和(自身を含む): 45283392

約数和(自身を除く): 23885852

約数列:

[1, 2, 4, 5, 10, 20, 131, 262, 524, 655, 1310, 2620, 8167, 16334, 32668, 40835, 81670, 163340, 1069877, 2139754, 4279508, 5349385, 10698770, 21397540]

約数ペア:

[(1, 21397540), (2, 10698770), (4, 5349385), (5, 4279508), (10, 2139754), (20, 1069877), (131, 163340), (262, 81670), (524, 40835), (655, 32668), (1310, 16334), (2620, 8167)]