19902775

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{421}}^1$

素因数の和:523

約数の個数: 24

約数和(自身を含む): 25954688

約数和(自身を除く): 6051913

約数列:

[1, 5, 25, 31, 61, 155, 305, 421, 775, 1525, 1891, 2105, 9455, 10525, 13051, 25681, 47275, 65255, 128405, 326275, 642025, 796111, 3980555, 19902775]

約数ペア:

[(1, 19902775), (5, 3980555), (25, 796111), (31, 642025), (61, 326275), (155, 128405), (305, 65255), (421, 47275), (775, 25681), (1525, 13051), (1891, 10525), (2105, 9455)]