21978268

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{2593}}^1$

素因数の和:2773

約数の個数: 24

約数和(自身を含む): 41690768

約数和(自身を除く): 19712500

約数列:

[1, 2, 4, 13, 26, 52, 163, 326, 652, 2119, 2593, 4238, 5186, 8476, 10372, 33709, 67418, 134836, 422659, 845318, 1690636, 5494567, 10989134, 21978268]

約数ペア:

[(1, 21978268), (2, 10989134), (4, 5494567), (13, 1690636), (26, 845318), (52, 422659), (163, 134836), (326, 67418), (652, 33709), (2119, 10372), (2593, 8476), (4238, 5186)]