81990380

素因数分解:

$2^2\times 5^1\times {\mathrm{211}}^1\times {\mathrm{19429}}^1$

素因数の和:19649

約数の個数: 24

約数和(自身を含む): 173004720

約数和(自身を除く): 91014340

約数列:

[1, 2, 4, 5, 10, 20, 211, 422, 844, 1055, 2110, 4220, 19429, 38858, 77716, 97145, 194290, 388580, 4099519, 8199038, 16398076, 20497595, 40995190, 81990380]

約数ペア:

[(1, 81990380), (2, 40995190), (4, 20497595), (5, 16398076), (10, 8199038), (20, 4099519), (211, 388580), (422, 194290), (844, 97145), (1055, 77716), (2110, 38858), (4220, 19429)]