21570280

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31721}}^1$

素因数の和:31749

約数の個数: 32

約数和(自身を含む): 51389640

約数和(自身を除く): 29819360

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31721, 63442, 126884, 158605, 253768, 317210, 539257, 634420, 1078514, 1268840, 2157028, 2696285, 4314056, 5392570, 10785140, 21570280]

約数ペア:

[(1, 21570280), (2, 10785140), (4, 5392570), (5, 4314056), (8, 2696285), (10, 2157028), (17, 1268840), (20, 1078514), (34, 634420), (40, 539257), (68, 317210), (85, 253768), (136, 158605), (170, 126884), (340, 63442), (680, 31721)]