20719340

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{139}}^1\times {\mathrm{257}}^1$

素因数の和:434

約数の個数: 48

約数和(自身を含む): 45511200

約数和(自身を除く): 24791860

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 139, 145, 257, 278, 290, 514, 556, 580, 695, 1028, 1285, 1390, 2570, 2780, 4031, 5140, 7453, 8062, 14906, 16124, 20155, 29812, 35723, 37265, 40310, 71446, 74530, 80620, 142892, 149060, 178615, 357230, 714460, 1035967, 2071934, 4143868, 5179835, 10359670, 20719340]

約数ペア:

[(1, 20719340), (2, 10359670), (4, 5179835), (5, 4143868), (10, 2071934), (20, 1035967), (29, 714460), (58, 357230), (116, 178615), (139, 149060), (145, 142892), (257, 80620), (278, 74530), (290, 71446), (514, 40310), (556, 37265), (580, 35723), (695, 29812), (1028, 20155), (1285, 16124), (1390, 14906), (2570, 8062), (2780, 7453), (4031, 5140)]