19851980

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{139}}^1\times {\mathrm{193}}^1$

素因数の和:378

約数の個数: 48

約数和(自身を含む): 43347360

約数和(自身を除く): 23495380

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 139, 148, 185, 193, 278, 370, 386, 556, 695, 740, 772, 965, 1390, 1930, 2780, 3860, 5143, 7141, 10286, 14282, 20572, 25715, 26827, 28564, 35705, 51430, 53654, 71410, 102860, 107308, 134135, 142820, 268270, 536540, 992599, 1985198, 3970396, 4962995, 9925990, 19851980]

約数ペア:

[(1, 19851980), (2, 9925990), (4, 4962995), (5, 3970396), (10, 1985198), (20, 992599), (37, 536540), (74, 268270), (139, 142820), (148, 134135), (185, 107308), (193, 102860), (278, 71410), (370, 53654), (386, 51430), (556, 35705), (695, 28564), (740, 26827), (772, 25715), (965, 20572), (1390, 14282), (1930, 10286), (2780, 7141), (3860, 5143)]