12639280

素因数分解:

$2^4\times 5^1\times {\mathrm{157991}}^1$

素因数の和:158004

約数の個数: 20

約数和(自身を含む): 29386512

約数和(自身を除く): 16747232

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 157991, 315982, 631964, 789955, 1263928, 1579910, 2527856, 3159820, 6319640, 12639280]

約数ペア:

[(1, 12639280), (2, 6319640), (4, 3159820), (5, 2527856), (8, 1579910), (10, 1263928), (16, 789955), (20, 631964), (40, 315982), (80, 157991)]