20778355

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{151}}^1$

素因数の和:271

約数の個数: 32

約数和(自身を含む): 28344960

約数和(自身を除く): 7566605

約数列:

[1, 5, 13, 29, 65, 73, 145, 151, 365, 377, 755, 949, 1885, 1963, 2117, 4379, 4745, 9815, 10585, 11023, 21895, 27521, 55115, 56927, 137605, 143299, 284635, 319667, 716495, 1598335, 4155671, 20778355]

約数ペア:

[(1, 20778355), (5, 4155671), (13, 1598335), (29, 716495), (65, 319667), (73, 284635), (145, 143299), (151, 137605), (365, 56927), (377, 55115), (755, 27521), (949, 21895), (1885, 11023), (1963, 10585), (2117, 9815), (4379, 4745)]