21686775

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{271}}^1$

素因数の和:392

約数の個数: 48

約数和(自身を含む): 39664128

約数和(自身を除く): 17977353

約数列:

[1, 3, 5, 11, 15, 25, 33, 55, 75, 97, 165, 271, 275, 291, 485, 813, 825, 1067, 1355, 1455, 2425, 2981, 3201, 4065, 5335, 6775, 7275, 8943, 14905, 16005, 20325, 26287, 26675, 44715, 74525, 78861, 80025, 131435, 223575, 289157, 394305, 657175, 867471, 1445785, 1971525, 4337355, 7228925, 21686775]

約数ペア:

[(1, 21686775), (3, 7228925), (5, 4337355), (11, 1971525), (15, 1445785), (25, 867471), (33, 657175), (55, 394305), (75, 289157), (97, 223575), (165, 131435), (271, 80025), (275, 78861), (291, 74525), (485, 44715), (813, 26675), (825, 26287), (1067, 20325), (1355, 16005), (1455, 14905), (2425, 8943), (2981, 7275), (3201, 6775), (4065, 5335)]