20987589

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{103}}^1\times {\mathrm{313}}^1$

素因数の和:457

約数の個数: 32

約数和(自身を含む): 33439744

約数和(自身を除く): 12452155

約数列:

[1, 3, 7, 21, 31, 93, 103, 217, 309, 313, 651, 721, 939, 2163, 2191, 3193, 6573, 9579, 9703, 22351, 29109, 32239, 67053, 67921, 96717, 203763, 225673, 677019, 999409, 2998227, 6995863, 20987589]

約数ペア:

[(1, 20987589), (3, 6995863), (7, 2998227), (21, 999409), (31, 677019), (93, 225673), (103, 203763), (217, 96717), (309, 67921), (313, 67053), (651, 32239), (721, 29109), (939, 22351), (2163, 9703), (2191, 9579), (3193, 6573)]