21253040

素因数分解:

$2^4\times 5^1\times {\mathrm{113}}^1\times {\mathrm{2351}}^1$

素因数の和:2477

約数の個数: 40

約数和(自身を含む): 49871808

約数和(自身を除く): 28618768

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 113, 226, 452, 565, 904, 1130, 1808, 2260, 2351, 4520, 4702, 9040, 9404, 11755, 18808, 23510, 37616, 47020, 94040, 188080, 265663, 531326, 1062652, 1328315, 2125304, 2656630, 4250608, 5313260, 10626520, 21253040]

約数ペア:

[(1, 21253040), (2, 10626520), (4, 5313260), (5, 4250608), (8, 2656630), (10, 2125304), (16, 1328315), (20, 1062652), (40, 531326), (80, 265663), (113, 188080), (226, 94040), (452, 47020), (565, 37616), (904, 23510), (1130, 18808), (1808, 11755), (2260, 9404), (2351, 9040), (4520, 4702)]