20813780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{277}}^1$

素因数の和:333

約数の個数: 72

約数和(自身を含む): 50183448

約数和(自身を除く): 29369668

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 277, 289, 340, 442, 554, 578, 884, 1105, 1108, 1156, 1385, 1445, 2210, 2770, 2890, 3601, 3757, 4420, 4709, 5540, 5780, 7202, 7514, 9418, 14404, 15028, 18005, 18785, 18836, 23545, 36010, 37570, 47090, 61217, 72020, 75140, 80053, 94180, 122434, 160106, 244868, 306085, 320212, 400265, 612170, 800530, 1040689, 1224340, 1601060, 2081378, 4162756, 5203445, 10406890, 20813780]

約数ペア:

[(1, 20813780), (2, 10406890), (4, 5203445), (5, 4162756), (10, 2081378), (13, 1601060), (17, 1224340), (20, 1040689), (26, 800530), (34, 612170), (52, 400265), (65, 320212), (68, 306085), (85, 244868), (130, 160106), (170, 122434), (221, 94180), (260, 80053), (277, 75140), (289, 72020), (340, 61217), (442, 47090), (554, 37570), (578, 36010), (884, 23545), (1105, 18836), (1108, 18785), (1156, 18005), (1385, 15028), (1445, 14404), (2210, 9418), (2770, 7514), (2890, 7202), (3601, 5780), (3757, 5540), (4420, 4709)]