21288355

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{4349}}^1$

素因数の和:4454

約数の個数: 16

約数和(自身を含む): 28188000

約数和(自身を除く): 6899645

約数列:

[1, 5, 11, 55, 89, 445, 979, 4349, 4895, 21745, 47839, 239195, 387061, 1935305, 4257671, 21288355]

約数ペア:

[(1, 21288355), (5, 4257671), (11, 1935305), (55, 387061), (89, 239195), (445, 47839), (979, 21745), (4349, 4895)]