21156920

素因数分解:

$2^3\times 5^1\times {\mathrm{383}}^1\times {\mathrm{1381}}^1$

素因数の和:1775

約数の個数: 32

約数和(自身を含む): 47761920

約数和(自身を除く): 26605000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 383, 766, 1381, 1532, 1915, 2762, 3064, 3830, 5524, 6905, 7660, 11048, 13810, 15320, 27620, 55240, 528923, 1057846, 2115692, 2644615, 4231384, 5289230, 10578460, 21156920]

約数ペア:

[(1, 21156920), (2, 10578460), (4, 5289230), (5, 4231384), (8, 2644615), (10, 2115692), (20, 1057846), (40, 528923), (383, 55240), (766, 27620), (1381, 15320), (1532, 13810), (1915, 11048), (2762, 7660), (3064, 6905), (3830, 5524)]