18431380

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{199}}^1\times {\mathrm{421}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 42537600

約数和(自身を除く): 24106220

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 199, 220, 398, 421, 796, 842, 995, 1684, 1990, 2105, 2189, 3980, 4210, 4378, 4631, 8420, 8756, 9262, 10945, 18524, 21890, 23155, 43780, 46310, 83779, 92620, 167558, 335116, 418895, 837790, 921569, 1675580, 1843138, 3686276, 4607845, 9215690, 18431380]

約数ペア:

[(1, 18431380), (2, 9215690), (4, 4607845), (5, 3686276), (10, 1843138), (11, 1675580), (20, 921569), (22, 837790), (44, 418895), (55, 335116), (110, 167558), (199, 92620), (220, 83779), (398, 46310), (421, 43780), (796, 23155), (842, 21890), (995, 18524), (1684, 10945), (1990, 9262), (2105, 8756), (2189, 8420), (3980, 4631), (4210, 4378)]