640928421

素因数分解:

$3^2\times 7^1\times {\mathrm{181}}^1\times {\mathrm{56207}}^1$

素因数の和:56401

約数の個数: 24

約数和(自身を含む): 1063905024

約数和(自身を除く): 422976603

約数列:

[1, 3, 7, 9, 21, 63, 181, 543, 1267, 1629, 3801, 11403, 56207, 168621, 393449, 505863, 1180347, 3541041, 10173467, 30520401, 71214269, 91561203, 213642807, 640928421]

約数ペア:

[(1, 640928421), (3, 213642807), (7, 91561203), (9, 71214269), (21, 30520401), (63, 10173467), (181, 3541041), (543, 1180347), (1267, 505863), (1629, 393449), (3801, 168621), (11403, 56207)]