21289820

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{4241}}^1$

素因数の和:4501

約数の個数: 24

約数和(自身を含む): 44897328

約数和(自身を除く): 23607508

約数列:

[1, 2, 4, 5, 10, 20, 251, 502, 1004, 1255, 2510, 4241, 5020, 8482, 16964, 21205, 42410, 84820, 1064491, 2128982, 4257964, 5322455, 10644910, 21289820]

約数ペア:

[(1, 21289820), (2, 10644910), (4, 5322455), (5, 4257964), (10, 2128982), (20, 1064491), (251, 84820), (502, 42410), (1004, 21205), (1255, 16964), (2510, 8482), (4241, 5020)]