21385975

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{2861}}^1$

素因数の和:2907

約数の個数: 24

約数和(自身を含む): 29810592

約数和(自身を除く): 8424617

約数列:

[1, 5, 13, 23, 25, 65, 115, 299, 325, 575, 1495, 2861, 7475, 14305, 37193, 65803, 71525, 185965, 329015, 855439, 929825, 1645075, 4277195, 21385975]

約数ペア:

[(1, 21385975), (5, 4277195), (13, 1645075), (23, 929825), (25, 855439), (65, 329015), (115, 185965), (299, 71525), (325, 65803), (575, 37193), (1495, 14305), (2861, 7475)]