20965840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1291}}^1$

素因数の和:1340

約数の個数: 80

約数和(自身を含む): 57674880

約数和(自身を除く): 36709040

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 29, 35, 40, 56, 58, 70, 80, 112, 116, 140, 145, 203, 232, 280, 290, 406, 464, 560, 580, 812, 1015, 1160, 1291, 1624, 2030, 2320, 2582, 3248, 4060, 5164, 6455, 8120, 9037, 10328, 12910, 16240, 18074, 20656, 25820, 36148, 37439, 45185, 51640, 72296, 74878, 90370, 103280, 144592, 149756, 180740, 187195, 262073, 299512, 361480, 374390, 524146, 599024, 722960, 748780, 1048292, 1310365, 1497560, 2096584, 2620730, 2995120, 4193168, 5241460, 10482920, 20965840]

約数ペア:

[(1, 20965840), (2, 10482920), (4, 5241460), (5, 4193168), (7, 2995120), (8, 2620730), (10, 2096584), (14, 1497560), (16, 1310365), (20, 1048292), (28, 748780), (29, 722960), (35, 599024), (40, 524146), (56, 374390), (58, 361480), (70, 299512), (80, 262073), (112, 187195), (116, 180740), (140, 149756), (145, 144592), (203, 103280), (232, 90370), (280, 74878), (290, 72296), (406, 51640), (464, 45185), (560, 37439), (580, 36148), (812, 25820), (1015, 20656), (1160, 18074), (1291, 16240), (1624, 12910), (2030, 10328), (2320, 9037), (2582, 8120), (3248, 6455), (4060, 5164)]