20578480

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{421}}^1$

素因数の和:494

約数の個数: 80

約数和(自身を含む): 52746624

約数和(自身を除く): 32168144

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 47, 52, 65, 80, 94, 104, 130, 188, 208, 235, 260, 376, 421, 470, 520, 611, 752, 842, 940, 1040, 1222, 1684, 1880, 2105, 2444, 3055, 3368, 3760, 4210, 4888, 5473, 6110, 6736, 8420, 9776, 10946, 12220, 16840, 19787, 21892, 24440, 27365, 33680, 39574, 43784, 48880, 54730, 79148, 87568, 98935, 109460, 158296, 197870, 218920, 257231, 316592, 395740, 437840, 514462, 791480, 1028924, 1286155, 1582960, 2057848, 2572310, 4115696, 5144620, 10289240, 20578480]

約数ペア:

[(1, 20578480), (2, 10289240), (4, 5144620), (5, 4115696), (8, 2572310), (10, 2057848), (13, 1582960), (16, 1286155), (20, 1028924), (26, 791480), (40, 514462), (47, 437840), (52, 395740), (65, 316592), (80, 257231), (94, 218920), (104, 197870), (130, 158296), (188, 109460), (208, 98935), (235, 87568), (260, 79148), (376, 54730), (421, 48880), (470, 43784), (520, 39574), (611, 33680), (752, 27365), (842, 24440), (940, 21892), (1040, 19787), (1222, 16840), (1684, 12220), (1880, 10946), (2105, 9776), (2444, 8420), (3055, 6736), (3368, 6110), (3760, 5473), (4210, 4888)]