20404580

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{443}}^1$

素因数の和:513

約数の個数: 72

約数和(自身を含む): 51020928

約数和(自身を除く): 30616348

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 49, 70, 94, 98, 140, 188, 196, 235, 245, 329, 443, 470, 490, 658, 886, 940, 980, 1316, 1645, 1772, 2215, 2303, 3101, 3290, 4430, 4606, 6202, 6580, 8860, 9212, 11515, 12404, 15505, 20821, 21707, 23030, 31010, 41642, 43414, 46060, 62020, 83284, 86828, 104105, 108535, 145747, 208210, 217070, 291494, 416420, 434140, 582988, 728735, 1020229, 1457470, 2040458, 2914940, 4080916, 5101145, 10202290, 20404580]

約数ペア:

[(1, 20404580), (2, 10202290), (4, 5101145), (5, 4080916), (7, 2914940), (10, 2040458), (14, 1457470), (20, 1020229), (28, 728735), (35, 582988), (47, 434140), (49, 416420), (70, 291494), (94, 217070), (98, 208210), (140, 145747), (188, 108535), (196, 104105), (235, 86828), (245, 83284), (329, 62020), (443, 46060), (470, 43414), (490, 41642), (658, 31010), (886, 23030), (940, 21707), (980, 20821), (1316, 15505), (1645, 12404), (1772, 11515), (2215, 9212), (2303, 8860), (3101, 6580), (3290, 6202), (4430, 4606)]