21109790

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{12491}}^1$

素因数の和:12524

約数の個数: 24

約数和(自身を含む): 41148648

約数和(自身を除く): 20038858

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 169, 338, 845, 1690, 12491, 24982, 62455, 124910, 162383, 324766, 811915, 1623830, 2110979, 4221958, 10554895, 21109790]

約数ペア:

[(1, 21109790), (2, 10554895), (5, 4221958), (10, 2110979), (13, 1623830), (26, 811915), (65, 324766), (130, 162383), (169, 124910), (338, 62455), (845, 24982), (1690, 12491)]