21137980

素因数分解:

$2^2\times 5^1\times {\mathrm{211}}^1\times {\mathrm{5009}}^1$

素因数の和:5229

約数の個数: 24

約数和(自身を含む): 44609040

約数和(自身を除く): 23471060

約数列:

[1, 2, 4, 5, 10, 20, 211, 422, 844, 1055, 2110, 4220, 5009, 10018, 20036, 25045, 50090, 100180, 1056899, 2113798, 4227596, 5284495, 10568990, 21137980]

約数ペア:

[(1, 21137980), (2, 10568990), (4, 5284495), (5, 4227596), (10, 2113798), (20, 1056899), (211, 100180), (422, 50090), (844, 25045), (1055, 20036), (2110, 10018), (4220, 5009)]