21000920

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3221}}^1$

素因数の和:3395

約数の個数: 32

約数和(自身を含む): 47556720

約数和(自身を除く): 26555800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3221, 3260, 6442, 6520, 12884, 16105, 25768, 32210, 64420, 128840, 525023, 1050046, 2100092, 2625115, 4200184, 5250230, 10500460, 21000920]

約数ペア:

[(1, 21000920), (2, 10500460), (4, 5250230), (5, 4200184), (8, 2625115), (10, 2100092), (20, 1050046), (40, 525023), (163, 128840), (326, 64420), (652, 32210), (815, 25768), (1304, 16105), (1630, 12884), (3221, 6520), (3260, 6442)]