21863740

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{173}}^1$

素因数の和:342

約数の個数: 48

約数和(自身を含む): 47355840

約数和(自身を除く): 25492100

約数列:

[1, 2, 4, 5, 10, 20, 71, 89, 142, 173, 178, 284, 346, 355, 356, 445, 692, 710, 865, 890, 1420, 1730, 1780, 3460, 6319, 12283, 12638, 15397, 24566, 25276, 30794, 31595, 49132, 61415, 61588, 63190, 76985, 122830, 126380, 153970, 245660, 307940, 1093187, 2186374, 4372748, 5465935, 10931870, 21863740]

約数ペア:

[(1, 21863740), (2, 10931870), (4, 5465935), (5, 4372748), (10, 2186374), (20, 1093187), (71, 307940), (89, 245660), (142, 153970), (173, 126380), (178, 122830), (284, 76985), (346, 63190), (355, 61588), (356, 61415), (445, 49132), (692, 31595), (710, 30794), (865, 25276), (890, 24566), (1420, 15397), (1730, 12638), (1780, 12283), (3460, 6319)]