20485990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{211}}^1$

素因数の和:317

約数の個数: 64

約数和(自身を含む): 45181440

約数和(自身を除く): 24695450

約数列:

[1, 2, 5, 7, 10, 14, 19, 35, 38, 70, 73, 95, 133, 146, 190, 211, 266, 365, 422, 511, 665, 730, 1022, 1055, 1330, 1387, 1477, 2110, 2555, 2774, 2954, 4009, 5110, 6935, 7385, 8018, 9709, 13870, 14770, 15403, 19418, 20045, 28063, 30806, 40090, 48545, 56126, 77015, 97090, 107821, 140315, 154030, 215642, 280630, 292657, 539105, 585314, 1078210, 1463285, 2048599, 2926570, 4097198, 10242995, 20485990]

約数ペア:

[(1, 20485990), (2, 10242995), (5, 4097198), (7, 2926570), (10, 2048599), (14, 1463285), (19, 1078210), (35, 585314), (38, 539105), (70, 292657), (73, 280630), (95, 215642), (133, 154030), (146, 140315), (190, 107821), (211, 97090), (266, 77015), (365, 56126), (422, 48545), (511, 40090), (665, 30806), (730, 28063), (1022, 20045), (1055, 19418), (1330, 15403), (1387, 14770), (1477, 13870), (2110, 9709), (2555, 8018), (2774, 7385), (2954, 6935), (4009, 5110)]