21780538

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{443}}^1$

素因数の和:550

約数の個数: 32

約数和(自身を含む): 36997632

約数和(自身を除く): 15217094

約数列:

[1, 2, 13, 26, 31, 61, 62, 122, 403, 443, 793, 806, 886, 1586, 1891, 3782, 5759, 11518, 13733, 24583, 27023, 27466, 49166, 54046, 178529, 351299, 357058, 702598, 837713, 1675426, 10890269, 21780538]

約数ペア:

[(1, 21780538), (2, 10890269), (13, 1675426), (26, 837713), (31, 702598), (61, 357058), (62, 351299), (122, 178529), (403, 54046), (443, 49166), (793, 27466), (806, 27023), (886, 24583), (1586, 13733), (1891, 11518), (3782, 5759)]