21691840

素因数分解:

$2^6\times 5^1\times {\mathrm{53}}^1\times {\mathrm{1279}}^1$

素因数の和:1349

約数の個数: 56

約数和(自身を含む): 52669440

約数和(自身を除く): 30977600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 53, 64, 80, 106, 160, 212, 265, 320, 424, 530, 848, 1060, 1279, 1696, 2120, 2558, 3392, 4240, 5116, 6395, 8480, 10232, 12790, 16960, 20464, 25580, 40928, 51160, 67787, 81856, 102320, 135574, 204640, 271148, 338935, 409280, 542296, 677870, 1084592, 1355740, 2169184, 2711480, 4338368, 5422960, 10845920, 21691840]

約数ペア:

[(1, 21691840), (2, 10845920), (4, 5422960), (5, 4338368), (8, 2711480), (10, 2169184), (16, 1355740), (20, 1084592), (32, 677870), (40, 542296), (53, 409280), (64, 338935), (80, 271148), (106, 204640), (160, 135574), (212, 102320), (265, 81856), (320, 67787), (424, 51160), (530, 40928), (848, 25580), (1060, 20464), (1279, 16960), (1696, 12790), (2120, 10232), (2558, 8480), (3392, 6395), (4240, 5116)]