21080020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81077}}^1$

素因数の和:81099

約数の個数: 24

約数和(自身を含む): 47673864

約数和(自身を除く): 26593844

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81077, 162154, 324308, 405385, 810770, 1054001, 1621540, 2108002, 4216004, 5270005, 10540010, 21080020]

約数ペア:

[(1, 21080020), (2, 10540010), (4, 5270005), (5, 4216004), (10, 2108002), (13, 1621540), (20, 1054001), (26, 810770), (52, 405385), (65, 324308), (130, 162154), (260, 81077)]