20971640

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{101}}^1\times {\mathrm{179}}^1$

素因数の和:320

約数の個数: 64

約数和(自身を含む): 49572000

約数和(自身を除く): 28600360

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 101, 116, 145, 179, 202, 232, 290, 358, 404, 505, 580, 716, 808, 895, 1010, 1160, 1432, 1790, 2020, 2929, 3580, 4040, 5191, 5858, 7160, 10382, 11716, 14645, 18079, 20764, 23432, 25955, 29290, 36158, 41528, 51910, 58580, 72316, 90395, 103820, 117160, 144632, 180790, 207640, 361580, 524291, 723160, 1048582, 2097164, 2621455, 4194328, 5242910, 10485820, 20971640]

約数ペア:

[(1, 20971640), (2, 10485820), (4, 5242910), (5, 4194328), (8, 2621455), (10, 2097164), (20, 1048582), (29, 723160), (40, 524291), (58, 361580), (101, 207640), (116, 180790), (145, 144632), (179, 117160), (202, 103820), (232, 90395), (290, 72316), (358, 58580), (404, 51910), (505, 41528), (580, 36158), (716, 29290), (808, 25955), (895, 23432), (1010, 20764), (1160, 18079), (1432, 14645), (1790, 11716), (2020, 10382), (2929, 7160), (3580, 5858), (4040, 5191)]