20645145

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{109}}^1$

素因数の和:207

約数の個数: 64

約数和(自身を含む): 39283200

約数和(自身を除く): 18638055

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 61, 69, 109, 115, 135, 183, 207, 305, 327, 345, 545, 549, 621, 915, 981, 1035, 1403, 1635, 1647, 2507, 2745, 2943, 3105, 4209, 4905, 6649, 7015, 7521, 8235, 12535, 12627, 14715, 19947, 21045, 22563, 33245, 37605, 37881, 59841, 63135, 67689, 99735, 112815, 152927, 179523, 189405, 299205, 338445, 458781, 764635, 897615, 1376343, 2293905, 4129029, 6881715, 20645145]

約数ペア:

[(1, 20645145), (3, 6881715), (5, 4129029), (9, 2293905), (15, 1376343), (23, 897615), (27, 764635), (45, 458781), (61, 338445), (69, 299205), (109, 189405), (115, 179523), (135, 152927), (183, 112815), (207, 99735), (305, 67689), (327, 63135), (345, 59841), (545, 37881), (549, 37605), (621, 33245), (915, 22563), (981, 21045), (1035, 19947), (1403, 14715), (1635, 12627), (1647, 12535), (2507, 8235), (2745, 7521), (2943, 7015), (3105, 6649), (4209, 4905)]