18961840

素因数分解:

$2^4\times 5^1\times {\mathrm{421}}^1\times {\mathrm{563}}^1$

素因数の和:997

約数の個数: 40

約数和(自身を含む): 44269488

約数和(自身を除く): 25307648

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 421, 563, 842, 1126, 1684, 2105, 2252, 2815, 3368, 4210, 4504, 5630, 6736, 8420, 9008, 11260, 16840, 22520, 33680, 45040, 237023, 474046, 948092, 1185115, 1896184, 2370230, 3792368, 4740460, 9480920, 18961840]

約数ペア:

[(1, 18961840), (2, 9480920), (4, 4740460), (5, 3792368), (8, 2370230), (10, 1896184), (16, 1185115), (20, 948092), (40, 474046), (80, 237023), (421, 45040), (563, 33680), (842, 22520), (1126, 16840), (1684, 11260), (2105, 9008), (2252, 8420), (2815, 6736), (3368, 5630), (4210, 4504)]