18800420

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1\times {\mathrm{163}}^1$

素因数の和:324

約数の個数: 48

約数和(自身を含む): 40776960

約数和(自身を除く): 21976540

約数列:

[1, 2, 4, 5, 10, 20, 73, 79, 146, 158, 163, 292, 316, 326, 365, 395, 652, 730, 790, 815, 1460, 1580, 1630, 3260, 5767, 11534, 11899, 12877, 23068, 23798, 25754, 28835, 47596, 51508, 57670, 59495, 64385, 115340, 118990, 128770, 237980, 257540, 940021, 1880042, 3760084, 4700105, 9400210, 18800420]

約数ペア:

[(1, 18800420), (2, 9400210), (4, 4700105), (5, 3760084), (10, 1880042), (20, 940021), (73, 257540), (79, 237980), (146, 128770), (158, 118990), (163, 115340), (292, 64385), (316, 59495), (326, 57670), (365, 51508), (395, 47596), (652, 28835), (730, 25754), (790, 23798), (815, 23068), (1460, 12877), (1580, 11899), (1630, 11534), (3260, 5767)]