20990858

素因数分解:

$2^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{73}}^1$

素因数の和:171

約数の個数: 64

約数和(自身を含む): 40919040

約数和(自身を除く): 19928182

約数列:

[1, 2, 7, 14, 19, 23, 38, 46, 47, 73, 94, 133, 146, 161, 266, 322, 329, 437, 511, 658, 874, 893, 1022, 1081, 1387, 1679, 1786, 2162, 2774, 3059, 3358, 3431, 6118, 6251, 6862, 7567, 9709, 11753, 12502, 15134, 19418, 20539, 23506, 24017, 31901, 41078, 48034, 63802, 65189, 78913, 130378, 143773, 157826, 223307, 287546, 446614, 456323, 552391, 912646, 1104782, 1499347, 2998694, 10495429, 20990858]

約数ペア:

[(1, 20990858), (2, 10495429), (7, 2998694), (14, 1499347), (19, 1104782), (23, 912646), (38, 552391), (46, 456323), (47, 446614), (73, 287546), (94, 223307), (133, 157826), (146, 143773), (161, 130378), (266, 78913), (322, 65189), (329, 63802), (437, 48034), (511, 41078), (658, 31901), (874, 24017), (893, 23506), (1022, 20539), (1081, 19418), (1387, 15134), (1679, 12502), (1786, 11753), (2162, 9709), (2774, 7567), (3059, 6862), (3358, 6251), (3431, 6118)]