21287920

素因数分解:

$2^4\times 5^1\times {\mathrm{266099}}^1$

素因数の和:266112

約数の個数: 20

約数和(自身を含む): 49494600

約数和(自身を除く): 28206680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266099, 532198, 1064396, 1330495, 2128792, 2660990, 4257584, 5321980, 10643960, 21287920]

約数ペア:

[(1, 21287920), (2, 10643960), (4, 5321980), (5, 4257584), (8, 2660990), (10, 2128792), (16, 1330495), (20, 1064396), (40, 532198), (80, 266099)]