19880497

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 26417664

約数和(自身を除く): 6537167

約数列:

[1, 7, 13, 17, 71, 91, 119, 181, 221, 497, 923, 1207, 1267, 1547, 2353, 3077, 6461, 8449, 12851, 15691, 16471, 21539, 40001, 89957, 109837, 167063, 218467, 280007, 1169441, 1529269, 2840071, 19880497]

約数ペア:

[(1, 19880497), (7, 2840071), (13, 1529269), (17, 1169441), (71, 280007), (91, 218467), (119, 167063), (181, 109837), (221, 89957), (497, 40001), (923, 21539), (1207, 16471), (1267, 15691), (1547, 12851), (2353, 8449), (3077, 6461)]