21199820

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{1187}}^1$

素因数の和:1262

約数の個数: 48

約数和(自身を含む): 47900160

約数和(自身を除く): 26700340

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 47, 76, 94, 95, 188, 190, 235, 380, 470, 893, 940, 1187, 1786, 2374, 3572, 4465, 4748, 5935, 8930, 11870, 17860, 22553, 23740, 45106, 55789, 90212, 111578, 112765, 223156, 225530, 278945, 451060, 557890, 1059991, 1115780, 2119982, 4239964, 5299955, 10599910, 21199820]

約数ペア:

[(1, 21199820), (2, 10599910), (4, 5299955), (5, 4239964), (10, 2119982), (19, 1115780), (20, 1059991), (38, 557890), (47, 451060), (76, 278945), (94, 225530), (95, 223156), (188, 112765), (190, 111578), (235, 90212), (380, 55789), (470, 45106), (893, 23740), (940, 22553), (1187, 17860), (1786, 11870), (2374, 8930), (3572, 5935), (4465, 4748)]