21018404

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{191}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 41997312

約数和(自身を除く): 20978908

約数列:

[1, 2, 4, 11, 22, 41, 44, 61, 82, 122, 164, 191, 244, 382, 451, 671, 764, 902, 1342, 1804, 2101, 2501, 2684, 4202, 5002, 7831, 8404, 10004, 11651, 15662, 23302, 27511, 31324, 46604, 55022, 86141, 110044, 128161, 172282, 256322, 344564, 477691, 512644, 955382, 1910764, 5254601, 10509202, 21018404]

約数ペア:

[(1, 21018404), (2, 10509202), (4, 5254601), (11, 1910764), (22, 955382), (41, 512644), (44, 477691), (61, 344564), (82, 256322), (122, 172282), (164, 128161), (191, 110044), (244, 86141), (382, 55022), (451, 46604), (671, 31324), (764, 27511), (902, 23302), (1342, 15662), (1804, 11651), (2101, 10004), (2501, 8404), (2684, 7831), (4202, 5002)]