21781090

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^2\times {\mathrm{349}}^1$

素因数の和:514

約数の個数: 24

約数和(自身を含む): 39822300

約数和(自身を除く): 18041210

約数列:

[1, 2, 5, 10, 79, 158, 349, 395, 698, 790, 1745, 3490, 6241, 12482, 27571, 31205, 55142, 62410, 137855, 275710, 2178109, 4356218, 10890545, 21781090]

約数ペア:

[(1, 21781090), (2, 10890545), (5, 4356218), (10, 2178109), (79, 275710), (158, 137855), (349, 62410), (395, 55142), (698, 31205), (790, 27571), (1745, 12482), (3490, 6241)]