21055851

素因数分解:

$3^2\times {\mathrm{31}}^1\times {\mathrm{163}}^1\times {\mathrm{463}}^1$

素因数の和:663

約数の個数: 24

約数和(自身を含む): 31655936

約数和(自身を除く): 10600085

約数列:

[1, 3, 9, 31, 93, 163, 279, 463, 489, 1389, 1467, 4167, 5053, 14353, 15159, 43059, 45477, 75469, 129177, 226407, 679221, 2339539, 7018617, 21055851]

約数ペア:

[(1, 21055851), (3, 7018617), (9, 2339539), (31, 679221), (93, 226407), (163, 129177), (279, 75469), (463, 45477), (489, 43059), (1389, 15159), (1467, 14353), (4167, 5053)]