21569247

素因数分解:

$3^4\times 7^1\times {\mathrm{109}}^1\times {\mathrm{349}}^1$

素因数の和:477

約数の個数: 40

約数和(自身を含む): 37268000

約数和(自身を除く): 15698753

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 109, 189, 327, 349, 567, 763, 981, 1047, 2289, 2443, 2943, 3141, 6867, 7329, 8829, 9423, 20601, 21987, 28269, 38041, 61803, 65961, 114123, 197883, 266287, 342369, 798861, 1027107, 2396583, 3081321, 7189749, 21569247]

約数ペア:

[(1, 21569247), (3, 7189749), (7, 3081321), (9, 2396583), (21, 1027107), (27, 798861), (63, 342369), (81, 266287), (109, 197883), (189, 114123), (327, 65961), (349, 61803), (567, 38041), (763, 28269), (981, 21987), (1047, 20601), (2289, 9423), (2443, 8829), (2943, 7329), (3141, 6867)]