20281779

素因数分解:

$3^3\times 7^1\times {\mathrm{239}}^1\times {\mathrm{449}}^1$

素因数の和:704

約数の個数: 32

約数和(自身を含む): 34560000

約数和(自身を除く): 14278221

約数列:

[1, 3, 7, 9, 21, 27, 63, 189, 239, 449, 717, 1347, 1673, 2151, 3143, 4041, 5019, 6453, 9429, 12123, 15057, 28287, 45171, 84861, 107311, 321933, 751177, 965799, 2253531, 2897397, 6760593, 20281779]

約数ペア:

[(1, 20281779), (3, 6760593), (7, 2897397), (9, 2253531), (21, 965799), (27, 751177), (63, 321933), (189, 107311), (239, 84861), (449, 45171), (717, 28287), (1347, 15057), (1673, 12123), (2151, 9429), (3143, 6453), (4041, 5019)]