19917964

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1$

素因数の和:298

約数の個数: 48

約数和(自身を含む): 39809952

約数和(自身を除く): 19891988

約数列:

[1, 2, 4, 11, 22, 41, 44, 61, 82, 122, 164, 181, 244, 362, 451, 671, 724, 902, 1342, 1804, 1991, 2501, 2684, 3982, 5002, 7421, 7964, 10004, 11041, 14842, 22082, 27511, 29684, 44164, 55022, 81631, 110044, 121451, 163262, 242902, 326524, 452681, 485804, 905362, 1810724, 4979491, 9958982, 19917964]

約数ペア:

[(1, 19917964), (2, 9958982), (4, 4979491), (11, 1810724), (22, 905362), (41, 485804), (44, 452681), (61, 326524), (82, 242902), (122, 163262), (164, 121451), (181, 110044), (244, 81631), (362, 55022), (451, 44164), (671, 29684), (724, 27511), (902, 22082), (1342, 14842), (1804, 11041), (1991, 10004), (2501, 7964), (2684, 7421), (3982, 5002)]