21781630

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{1223}}^1$

素因数の和:1380

約数の個数: 32

約数和(自身を含む): 42565824

約数和(自身を除く): 20784194

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 137, 274, 685, 1223, 1370, 1781, 2446, 3562, 6115, 8905, 12230, 15899, 17810, 31798, 79495, 158990, 167551, 335102, 837755, 1675510, 2178163, 4356326, 10890815, 21781630]

約数ペア:

[(1, 21781630), (2, 10890815), (5, 4356326), (10, 2178163), (13, 1675510), (26, 837755), (65, 335102), (130, 167551), (137, 158990), (274, 79495), (685, 31798), (1223, 17810), (1370, 15899), (1781, 12230), (2446, 8905), (3562, 6115)]