21321025

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:154

約数の個数: 48

約数和(自身を含む): 30998016

約数和(自身を除く): 9676991

約数列:

[1, 5, 11, 25, 31, 41, 55, 61, 155, 205, 275, 305, 341, 451, 671, 775, 1025, 1271, 1525, 1705, 1891, 2255, 2501, 3355, 6355, 8525, 9455, 11275, 12505, 13981, 16775, 20801, 27511, 31775, 47275, 62525, 69905, 77531, 104005, 137555, 349525, 387655, 520025, 687775, 852841, 1938275, 4264205, 21321025]

約数ペア:

[(1, 21321025), (5, 4264205), (11, 1938275), (25, 852841), (31, 687775), (41, 520025), (55, 387655), (61, 349525), (155, 137555), (205, 104005), (275, 77531), (305, 69905), (341, 62525), (451, 47275), (671, 31775), (775, 27511), (1025, 20801), (1271, 16775), (1525, 13981), (1705, 12505), (1891, 11275), (2255, 9455), (2501, 8525), (3355, 6355)]