20998747

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{167}}^1$

素因数の和:279

約数の個数: 32

約数和(自身を含む): 27869184

約数和(自身を除く): 6870437

約数列:

[1, 7, 11, 23, 71, 77, 161, 167, 253, 497, 781, 1169, 1633, 1771, 1837, 3841, 5467, 11431, 11857, 12859, 17963, 26887, 42251, 82999, 125741, 130427, 272711, 295757, 912989, 1908977, 2999821, 20998747]

約数ペア:

[(1, 20998747), (7, 2999821), (11, 1908977), (23, 912989), (71, 295757), (77, 272711), (161, 130427), (167, 125741), (253, 82999), (497, 42251), (781, 26887), (1169, 17963), (1633, 12859), (1771, 11857), (1837, 11431), (3841, 5467)]