21058420

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{421}}^1$

素因数の和:532

約数の個数: 48

約数和(自身を含む): 46153296

約数和(自身を除く): 25094876

約数列:

[1, 2, 4, 5, 10, 20, 41, 61, 82, 122, 164, 205, 244, 305, 410, 421, 610, 820, 842, 1220, 1684, 2105, 2501, 4210, 5002, 8420, 10004, 12505, 17261, 25010, 25681, 34522, 50020, 51362, 69044, 86305, 102724, 128405, 172610, 256810, 345220, 513620, 1052921, 2105842, 4211684, 5264605, 10529210, 21058420]

約数ペア:

[(1, 21058420), (2, 10529210), (4, 5264605), (5, 4211684), (10, 2105842), (20, 1052921), (41, 513620), (61, 345220), (82, 256810), (122, 172610), (164, 128405), (205, 102724), (244, 86305), (305, 69044), (410, 51362), (421, 50020), (610, 34522), (820, 25681), (842, 25010), (1220, 17261), (1684, 12505), (2105, 10004), (2501, 8420), (4210, 5002)]