21000478540

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{2767}}^1\times {\mathrm{6221}}^1$

素因数の和:9058

約数の個数: 48

約数和(自身を含む): 44847379584

約数和(自身を除く): 23846901044

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 2767, 5534, 6221, 11068, 12442, 13835, 24884, 27670, 31105, 55340, 62210, 124420, 168787, 337574, 379481, 675148, 758962, 843935, 1517924, 1687870, 1897405, 3375740, 3794810, 7589620, 17213507, 34427014, 68854028, 86067535, 172135070, 344270140, 1050023927, 2100047854, 4200095708, 5250119635, 10500239270, 21000478540]

約数ペア:

[(1, 21000478540), (2, 10500239270), (4, 5250119635), (5, 4200095708), (10, 2100047854), (20, 1050023927), (61, 344270140), (122, 172135070), (244, 86067535), (305, 68854028), (610, 34427014), (1220, 17213507), (2767, 7589620), (5534, 3794810), (6221, 3375740), (11068, 1897405), (12442, 1687870), (13835, 1517924), (24884, 843935), (27670, 758962), (31105, 675148), (55340, 379481), (62210, 337574), (124420, 168787)]