20981849

素因数分解:

$7^2\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{163}}^1$

素因数の和:285

約数の個数: 24

約数和(自身を含む): 25576128

約数和(自身を除く): 4594279

約数列:

[1, 7, 37, 49, 71, 163, 259, 497, 1141, 1813, 2627, 3479, 6031, 7987, 11573, 18389, 42217, 81011, 128723, 295519, 428201, 567077, 2997407, 20981849]

約数ペア:

[(1, 20981849), (7, 2997407), (37, 567077), (49, 428201), (71, 295519), (163, 128723), (259, 81011), (497, 42217), (1141, 18389), (1813, 11573), (2627, 7987), (3479, 6031)]