19987220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{1933}}^1$

素因数の和:2000

約数の個数: 48

約数和(自身を含む): 46787328

約数和(自身を除く): 26800108

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 47, 55, 94, 110, 188, 220, 235, 470, 517, 940, 1034, 1933, 2068, 2585, 3866, 5170, 7732, 9665, 10340, 19330, 21263, 38660, 42526, 85052, 90851, 106315, 181702, 212630, 363404, 425260, 454255, 908510, 999361, 1817020, 1998722, 3997444, 4996805, 9993610, 19987220]

約数ペア:

[(1, 19987220), (2, 9993610), (4, 4996805), (5, 3997444), (10, 1998722), (11, 1817020), (20, 999361), (22, 908510), (44, 454255), (47, 425260), (55, 363404), (94, 212630), (110, 181702), (188, 106315), (220, 90851), (235, 85052), (470, 42526), (517, 38660), (940, 21263), (1034, 19330), (1933, 10340), (2068, 9665), (2585, 7732), (3866, 5170)]