21536660

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{127}}^1\times {\mathrm{139}}^1$

素因数の和:336

約数の個数: 48

約数和(自身を含む): 46663680

約数和(自身を除く): 25127020

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 127, 139, 244, 254, 278, 305, 508, 556, 610, 635, 695, 1220, 1270, 1390, 2540, 2780, 7747, 8479, 15494, 16958, 17653, 30988, 33916, 35306, 38735, 42395, 70612, 77470, 84790, 88265, 154940, 169580, 176530, 353060, 1076833, 2153666, 4307332, 5384165, 10768330, 21536660]

約数ペア:

[(1, 21536660), (2, 10768330), (4, 5384165), (5, 4307332), (10, 2153666), (20, 1076833), (61, 353060), (122, 176530), (127, 169580), (139, 154940), (244, 88265), (254, 84790), (278, 77470), (305, 70612), (508, 42395), (556, 38735), (610, 35306), (635, 33916), (695, 30988), (1220, 17653), (1270, 16958), (1390, 15494), (2540, 8479), (2780, 7747)]