21018820

素因数分解:

$2^2\times 5^1\times {\mathrm{761}}^1\times {\mathrm{1381}}^1$

素因数の和:2151

約数の個数: 24

約数和(自身を含む): 44229528

約数和(自身を除く): 23210708

約数列:

[1, 2, 4, 5, 10, 20, 761, 1381, 1522, 2762, 3044, 3805, 5524, 6905, 7610, 13810, 15220, 27620, 1050941, 2101882, 4203764, 5254705, 10509410, 21018820]

約数ペア:

[(1, 21018820), (2, 10509410), (4, 5254705), (5, 4203764), (10, 2101882), (20, 1050941), (761, 27620), (1381, 15220), (1522, 13810), (2762, 7610), (3044, 6905), (3805, 5524)]