437840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{421}}^1$

素因数の和:447

約数の個数: 40

約数和(自身を含む): 1098888

約数和(自身を除く): 661048

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 421, 520, 842, 1040, 1684, 2105, 3368, 4210, 5473, 6736, 8420, 10946, 16840, 21892, 27365, 33680, 43784, 54730, 87568, 109460, 218920, 437840]

約数ペア:

[(1, 437840), (2, 218920), (4, 109460), (5, 87568), (8, 54730), (10, 43784), (13, 33680), (16, 27365), (20, 21892), (26, 16840), (40, 10946), (52, 8420), (65, 6736), (80, 5473), (104, 4210), (130, 3368), (208, 2105), (260, 1684), (421, 1040), (520, 842)]