21120145

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{1531}}^1$

素因数の和:1656

約数の個数: 16

約数和(自身を含む): 26472960

約数和(自身を除く): 5352815

約数列:

[1, 5, 31, 89, 155, 445, 1531, 2759, 7655, 13795, 47461, 136259, 237305, 681295, 4224029, 21120145]

約数ペア:

[(1, 21120145), (5, 4224029), (31, 681295), (89, 237305), (155, 136259), (445, 47461), (1531, 13795), (2759, 7655)]