21728511

素因数分解:

$3^2\times 7^2\times {\mathrm{29}}^1\times {\mathrm{1699}}^1$

素因数の和:1748

約数の個数: 36

約数和(自身を含む): 37791000

約数和(自身を除く): 16062489

約数列:

[1, 3, 7, 9, 21, 29, 49, 63, 87, 147, 203, 261, 441, 609, 1421, 1699, 1827, 4263, 5097, 11893, 12789, 15291, 35679, 49271, 83251, 107037, 147813, 249753, 344897, 443439, 749259, 1034691, 2414279, 3104073, 7242837, 21728511]

約数ペア:

[(1, 21728511), (3, 7242837), (7, 3104073), (9, 2414279), (21, 1034691), (29, 749259), (49, 443439), (63, 344897), (87, 249753), (147, 147813), (203, 107037), (261, 83251), (441, 49271), (609, 35679), (1421, 15291), (1699, 12789), (1827, 11893), (4263, 5097)]