81511640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{291113}}^1$

素因数の和:291131

約数の個数: 32

約数和(自身を含む): 209602080

約数和(自身を除く): 128090440

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 291113, 582226, 1164452, 1455565, 2037791, 2328904, 2911130, 4075582, 5822260, 8151164, 10188955, 11644520, 16302328, 20377910, 40755820, 81511640]

約数ペア:

[(1, 81511640), (2, 40755820), (4, 20377910), (5, 16302328), (7, 11644520), (8, 10188955), (10, 8151164), (14, 5822260), (20, 4075582), (28, 2911130), (35, 2328904), (40, 2037791), (56, 1455565), (70, 1164452), (140, 582226), (280, 291113)]