21205390

素因数分解:

$2^1\times 5^1\times {\mathrm{1019}}^1\times {\mathrm{2081}}^1$

素因数の和:3107

約数の個数: 16

約数和(自身を含む): 38225520

約数和(自身を除く): 17020130

約数列:

[1, 2, 5, 10, 1019, 2038, 2081, 4162, 5095, 10190, 10405, 20810, 2120539, 4241078, 10602695, 21205390]

約数ペア:

[(1, 21205390), (2, 10602695), (5, 4241078), (10, 2120539), (1019, 20810), (2038, 10405), (2081, 10190), (4162, 5095)]