20397951

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{149}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 35380800

約数和(自身を除く): 14982849

約数列:

[1, 3, 7, 9, 21, 41, 53, 63, 123, 149, 159, 287, 369, 371, 447, 477, 861, 1043, 1113, 1341, 2173, 2583, 3129, 3339, 6109, 6519, 7897, 9387, 15211, 18327, 19557, 23691, 42763, 45633, 54981, 55279, 71073, 128289, 136899, 165837, 323777, 384867, 497511, 971331, 2266439, 2913993, 6799317, 20397951]

約数ペア:

[(1, 20397951), (3, 6799317), (7, 2913993), (9, 2266439), (21, 971331), (41, 497511), (53, 384867), (63, 323777), (123, 165837), (149, 136899), (159, 128289), (287, 71073), (369, 55279), (371, 54981), (447, 45633), (477, 42763), (861, 23691), (1043, 19557), (1113, 18327), (1341, 15211), (2173, 9387), (2583, 7897), (3129, 6519), (3339, 6109)]