20212881

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{709}}^1$

素因数の和:785

約数の個数: 32

約数和(自身を含む): 31489920

約数和(自身を除く): 11277039

約数列:

[1, 3, 13, 17, 39, 43, 51, 129, 221, 559, 663, 709, 731, 1677, 2127, 2193, 9217, 9503, 12053, 27651, 28509, 30487, 36159, 91461, 156689, 396331, 470067, 518279, 1188993, 1554837, 6737627, 20212881]

約数ペア:

[(1, 20212881), (3, 6737627), (13, 1554837), (17, 1188993), (39, 518279), (43, 470067), (51, 396331), (129, 156689), (221, 91461), (559, 36159), (663, 30487), (709, 28509), (731, 27651), (1677, 12053), (2127, 9503), (2193, 9217)]