18986891

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{151}}^1$

素因数の和:263

約数の個数: 32

約数和(自身を含む): 25214976

約数和(自身を除く): 6228085

約数列:

[1, 7, 11, 23, 71, 77, 151, 161, 253, 497, 781, 1057, 1633, 1661, 1771, 3473, 5467, 10721, 11431, 11627, 17963, 24311, 38203, 75047, 117931, 125741, 246583, 267421, 825517, 1726081, 2712413, 18986891]

約数ペア:

[(1, 18986891), (7, 2712413), (11, 1726081), (23, 825517), (71, 267421), (77, 246583), (151, 125741), (161, 117931), (253, 75047), (497, 38203), (781, 24311), (1057, 17963), (1633, 11627), (1661, 11431), (1771, 10721), (3473, 5467)]