21239140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81689}}^1$

素因数の和:81711

約数の個数: 24

約数和(自身を含む): 48033720

約数和(自身を除く): 26794580

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81689, 163378, 326756, 408445, 816890, 1061957, 1633780, 2123914, 4247828, 5309785, 10619570, 21239140]

約数ペア:

[(1, 21239140), (2, 10619570), (4, 5309785), (5, 4247828), (10, 2123914), (13, 1633780), (20, 1061957), (26, 816890), (52, 408445), (65, 326756), (130, 163378), (260, 81689)]