21172655

素因数分解:

$5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{971}}^1$

素因数の和:1079

約数の個数: 24

約数和(自身を含む): 29918160

約数和(自身を除く): 8745505

約数列:

[1, 5, 7, 35, 49, 89, 245, 445, 623, 971, 3115, 4361, 4855, 6797, 21805, 33985, 47579, 86419, 237895, 432095, 604933, 3024665, 4234531, 21172655]

約数ペア:

[(1, 21172655), (5, 4234531), (7, 3024665), (35, 604933), (49, 432095), (89, 237895), (245, 86419), (445, 47579), (623, 33985), (971, 21805), (3115, 6797), (4361, 4855)]