20990123

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{2699}}^1$

素因数の和:2818

約数の個数: 16

約数和(自身を含む): 26438400

約数和(自身を除く): 5448277

約数列:

[1, 7, 11, 77, 101, 707, 1111, 2699, 7777, 18893, 29689, 207823, 272599, 1908193, 2998589, 20990123]

約数ペア:

[(1, 20990123), (7, 2998589), (11, 1908193), (77, 272599), (101, 207823), (707, 29689), (1111, 18893), (2699, 7777)]