18915728

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{211}}^1\times {\mathrm{431}}^1$

素因数の和:663

約数の個数: 40

約数和(自身を含む): 39747456

約数和(自身を除く): 20831728

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 211, 422, 431, 844, 862, 1688, 1724, 2743, 3376, 3448, 5486, 5603, 6896, 10972, 11206, 21944, 22412, 43888, 44824, 89648, 90941, 181882, 363764, 727528, 1182233, 1455056, 2364466, 4728932, 9457864, 18915728]

約数ペア:

[(1, 18915728), (2, 9457864), (4, 4728932), (8, 2364466), (13, 1455056), (16, 1182233), (26, 727528), (52, 363764), (104, 181882), (208, 90941), (211, 89648), (422, 44824), (431, 43888), (844, 22412), (862, 21944), (1688, 11206), (1724, 10972), (2743, 6896), (3376, 5603), (3448, 5486)]