20318780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{349}}^1$

素因数の和:470

約数の個数: 48

約数和(自身を含む): 44452800

約数和(自身を除く): 24134020

約数列:

[1, 2, 4, 5, 10, 20, 41, 71, 82, 142, 164, 205, 284, 349, 355, 410, 698, 710, 820, 1396, 1420, 1745, 2911, 3490, 5822, 6980, 11644, 14309, 14555, 24779, 28618, 29110, 49558, 57236, 58220, 71545, 99116, 123895, 143090, 247790, 286180, 495580, 1015939, 2031878, 4063756, 5079695, 10159390, 20318780]

約数ペア:

[(1, 20318780), (2, 10159390), (4, 5079695), (5, 4063756), (10, 2031878), (20, 1015939), (41, 495580), (71, 286180), (82, 247790), (142, 143090), (164, 123895), (205, 99116), (284, 71545), (349, 58220), (355, 57236), (410, 49558), (698, 29110), (710, 28618), (820, 24779), (1396, 14555), (1420, 14309), (1745, 11644), (2911, 6980), (3490, 5822)]