21031731

素因数分解:

$3^4\times 7^3\times {\mathrm{757}}^1$

素因数の和:790

約数の個数: 40

約数和(自身を含む): 36687200

約数和(自身を除く): 15655469

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 343, 441, 567, 757, 1029, 1323, 2271, 3087, 3969, 5299, 6813, 9261, 15897, 20439, 27783, 37093, 47691, 61317, 111279, 143073, 259651, 333837, 429219, 778953, 1001511, 2336859, 3004533, 7010577, 21031731]

約数ペア:

[(1, 21031731), (3, 7010577), (7, 3004533), (9, 2336859), (21, 1001511), (27, 778953), (49, 429219), (63, 333837), (81, 259651), (147, 143073), (189, 111279), (343, 61317), (441, 47691), (567, 37093), (757, 27783), (1029, 20439), (1323, 15897), (2271, 9261), (3087, 6813), (3969, 5299)]