21270620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{1109}}^1$

素因数の和:1262

約数の個数: 48

約数和(自身を含む): 51468480

約数和(自身を除く): 30197860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 137, 140, 274, 548, 685, 959, 1109, 1370, 1918, 2218, 2740, 3836, 4436, 4795, 5545, 7763, 9590, 11090, 15526, 19180, 22180, 31052, 38815, 77630, 151933, 155260, 303866, 607732, 759665, 1063531, 1519330, 2127062, 3038660, 4254124, 5317655, 10635310, 21270620]

約数ペア:

[(1, 21270620), (2, 10635310), (4, 5317655), (5, 4254124), (7, 3038660), (10, 2127062), (14, 1519330), (20, 1063531), (28, 759665), (35, 607732), (70, 303866), (137, 155260), (140, 151933), (274, 77630), (548, 38815), (685, 31052), (959, 22180), (1109, 19180), (1370, 15526), (1918, 11090), (2218, 9590), (2740, 7763), (3836, 5545), (4436, 4795)]