21263720

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4877}}^1$

素因数の和:4997

約数の個数: 32

約数和(自身を含む): 48292200

約数和(自身を除く): 27028480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4877, 9754, 19508, 24385, 39016, 48770, 97540, 195080, 531593, 1063186, 2126372, 2657965, 4252744, 5315930, 10631860, 21263720]

約数ペア:

[(1, 21263720), (2, 10631860), (4, 5315930), (5, 4252744), (8, 2657965), (10, 2126372), (20, 1063186), (40, 531593), (109, 195080), (218, 97540), (436, 48770), (545, 39016), (872, 24385), (1090, 19508), (2180, 9754), (4360, 4877)]