21986920

素因数分解:

$2^3\times 5^1\times {\mathrm{523}}^1\times {\mathrm{1051}}^1$

素因数の和:1585

約数の個数: 32

約数和(自身を含む): 49612320

約数和(自身を除く): 27625400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 523, 1046, 1051, 2092, 2102, 2615, 4184, 4204, 5230, 5255, 8408, 10460, 10510, 20920, 21020, 42040, 549673, 1099346, 2198692, 2748365, 4397384, 5496730, 10993460, 21986920]

約数ペア:

[(1, 21986920), (2, 10993460), (4, 5496730), (5, 4397384), (8, 2748365), (10, 2198692), (20, 1099346), (40, 549673), (523, 42040), (1046, 21020), (1051, 20920), (2092, 10510), (2102, 10460), (2615, 8408), (4184, 5255), (4204, 5230)]