21129656

素因数分解:

$2^3\times {\mathrm{67}}^1\times {\mathrm{79}}^1\times {\mathrm{499}}^1$

素因数の和:651

約数の個数: 32

約数和(自身を含む): 40800000

約数和(自身を除く): 19670344

約数列:

[1, 2, 4, 8, 67, 79, 134, 158, 268, 316, 499, 536, 632, 998, 1996, 3992, 5293, 10586, 21172, 33433, 39421, 42344, 66866, 78842, 133732, 157684, 267464, 315368, 2641207, 5282414, 10564828, 21129656]

約数ペア:

[(1, 21129656), (2, 10564828), (4, 5282414), (8, 2641207), (67, 315368), (79, 267464), (134, 157684), (158, 133732), (268, 78842), (316, 66866), (499, 42344), (536, 39421), (632, 33433), (998, 21172), (1996, 10586), (3992, 5293)]