21555513

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{109}}^1$

素因数の和:238

約数の個数: 48

約数和(自身を含む): 37248640

約数和(自身を除く): 15693127

約数列:

[1, 3, 7, 9, 21, 43, 63, 73, 109, 129, 219, 301, 327, 387, 511, 657, 763, 903, 981, 1533, 2289, 2709, 3139, 4599, 4687, 6867, 7957, 9417, 14061, 21973, 23871, 28251, 32809, 42183, 55699, 65919, 71613, 98427, 167097, 197757, 295281, 342151, 501291, 1026453, 2395057, 3079359, 7185171, 21555513]

約数ペア:

[(1, 21555513), (3, 7185171), (7, 3079359), (9, 2395057), (21, 1026453), (43, 501291), (63, 342151), (73, 295281), (109, 197757), (129, 167097), (219, 98427), (301, 71613), (327, 65919), (387, 55699), (511, 42183), (657, 32809), (763, 28251), (903, 23871), (981, 21973), (1533, 14061), (2289, 9417), (2709, 7957), (3139, 6867), (4599, 4687)]