81265520

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20731}}^1$

素因数の和:20758

約数の個数: 60

約数和(自身を含む): 219800664

約数和(自身を除く): 138535144

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20731, 41462, 82924, 103655, 145117, 165848, 207310, 290234, 331696, 414620, 580468, 725585, 829240, 1015819, 1160936, 1451170, 1658480, 2031638, 2321872, 2902340, 4063276, 5079095, 5804680, 8126552, 10158190, 11609360, 16253104, 20316380, 40632760, 81265520]

約数ペア:

[(1, 81265520), (2, 40632760), (4, 20316380), (5, 16253104), (7, 11609360), (8, 10158190), (10, 8126552), (14, 5804680), (16, 5079095), (20, 4063276), (28, 2902340), (35, 2321872), (40, 2031638), (49, 1658480), (56, 1451170), (70, 1160936), (80, 1015819), (98, 829240), (112, 725585), (140, 580468), (196, 414620), (245, 331696), (280, 290234), (392, 207310), (490, 165848), (560, 145117), (784, 103655), (980, 82924), (1960, 41462), (3920, 20731)]