21129563

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{53}}^1\times {\mathrm{337}}^1$

素因数の和:423

約数の個数: 24

約数和(自身を含む): 26720928

約数和(自身を除く): 5591365

約数列:

[1, 7, 13, 53, 91, 169, 337, 371, 689, 1183, 2359, 4381, 4823, 8957, 17861, 30667, 56953, 62699, 125027, 232193, 398671, 1625351, 3018509, 21129563]

約数ペア:

[(1, 21129563), (7, 3018509), (13, 1625351), (53, 398671), (91, 232193), (169, 125027), (337, 62699), (371, 56953), (689, 30667), (1183, 17861), (2359, 8957), (4381, 4823)]