18759760

素因数分解:

$2^4\times 5^1\times {\mathrm{421}}^1\times {\mathrm{557}}^1$

素因数の和:991

約数の個数: 40

約数和(自身を含む): 43798536

約数和(自身を除く): 25038776

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 421, 557, 842, 1114, 1684, 2105, 2228, 2785, 3368, 4210, 4456, 5570, 6736, 8420, 8912, 11140, 16840, 22280, 33680, 44560, 234497, 468994, 937988, 1172485, 1875976, 2344970, 3751952, 4689940, 9379880, 18759760]

約数ペア:

[(1, 18759760), (2, 9379880), (4, 4689940), (5, 3751952), (8, 2344970), (10, 1875976), (16, 1172485), (20, 937988), (40, 468994), (80, 234497), (421, 44560), (557, 33680), (842, 22280), (1114, 16840), (1684, 11140), (2105, 8912), (2228, 8420), (2785, 6736), (3368, 5570), (4210, 4456)]