21340431

素因数分解:

$3^2\times 7^3\times {\mathrm{31}}^1\times {\mathrm{223}}^1$

素因数の和:281

約数の個数: 48

約数和(自身を含む): 37273600

約数和(自身を除く): 15933169

約数列:

[1, 3, 7, 9, 21, 31, 49, 63, 93, 147, 217, 223, 279, 343, 441, 651, 669, 1029, 1519, 1561, 1953, 2007, 3087, 4557, 4683, 6913, 10633, 10927, 13671, 14049, 20739, 31899, 32781, 48391, 62217, 76489, 95697, 98343, 145173, 229467, 338737, 435519, 688401, 1016211, 2371159, 3048633, 7113477, 21340431]

約数ペア:

[(1, 21340431), (3, 7113477), (7, 3048633), (9, 2371159), (21, 1016211), (31, 688401), (49, 435519), (63, 338737), (93, 229467), (147, 145173), (217, 98343), (223, 95697), (279, 76489), (343, 62217), (441, 48391), (651, 32781), (669, 31899), (1029, 20739), (1519, 14049), (1561, 13671), (1953, 10927), (2007, 10633), (3087, 6913), (4557, 4683)]