19999640

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{6329}}^1$

素因数の和:6419

約数の個数: 32

約数和(自身を含む): 45576000

約数和(自身を除く): 25576360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 6329, 12658, 25316, 31645, 50632, 63290, 126580, 253160, 499991, 999982, 1999964, 2499955, 3999928, 4999910, 9999820, 19999640]

約数ペア:

[(1, 19999640), (2, 9999820), (4, 4999910), (5, 3999928), (8, 2499955), (10, 1999964), (20, 999982), (40, 499991), (79, 253160), (158, 126580), (316, 63290), (395, 50632), (632, 31645), (790, 25316), (1580, 12658), (3160, 6329)]