20991396

素因数分解:

$2^2\times 3^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{2393}}^1$

素因数の和:2460

約数の個数: 48

約数和(自身を含む): 53089344

約数和(自身を除く): 32097948

約数列:

[1, 2, 3, 4, 6, 12, 17, 34, 43, 51, 68, 86, 102, 129, 172, 204, 258, 516, 731, 1462, 2193, 2393, 2924, 4386, 4786, 7179, 8772, 9572, 14358, 28716, 40681, 81362, 102899, 122043, 162724, 205798, 244086, 308697, 411596, 488172, 617394, 1234788, 1749283, 3498566, 5247849, 6997132, 10495698, 20991396]

約数ペア:

[(1, 20991396), (2, 10495698), (3, 6997132), (4, 5247849), (6, 3498566), (12, 1749283), (17, 1234788), (34, 617394), (43, 488172), (51, 411596), (68, 308697), (86, 244086), (102, 205798), (129, 162724), (172, 122043), (204, 102899), (258, 81362), (516, 40681), (731, 28716), (1462, 14358), (2193, 9572), (2393, 8772), (2924, 7179), (4386, 4786)]