21138640

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{13907}}^1$

素因数の和:13939

約数の個数: 40

約数和(自身を含む): 51737760

約数和(自身を除く): 30599120

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 380, 760, 1520, 13907, 27814, 55628, 69535, 111256, 139070, 222512, 264233, 278140, 528466, 556280, 1056932, 1112560, 1321165, 2113864, 2642330, 4227728, 5284660, 10569320, 21138640]

約数ペア:

[(1, 21138640), (2, 10569320), (4, 5284660), (5, 4227728), (8, 2642330), (10, 2113864), (16, 1321165), (19, 1112560), (20, 1056932), (38, 556280), (40, 528466), (76, 278140), (80, 264233), (95, 222512), (152, 139070), (190, 111256), (304, 69535), (380, 55628), (760, 27814), (1520, 13907)]