21099980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{8719}}^1$

素因数の和:8750

約数の個数: 36

約数和(自身を含む): 48709920

約数和(自身を除く): 27609940

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 121, 220, 242, 484, 605, 1210, 2420, 8719, 17438, 34876, 43595, 87190, 95909, 174380, 191818, 383636, 479545, 959090, 1054999, 1918180, 2109998, 4219996, 5274995, 10549990, 21099980]

約数ペア:

[(1, 21099980), (2, 10549990), (4, 5274995), (5, 4219996), (10, 2109998), (11, 1918180), (20, 1054999), (22, 959090), (44, 479545), (55, 383636), (110, 191818), (121, 174380), (220, 95909), (242, 87190), (484, 43595), (605, 34876), (1210, 17438), (2420, 8719)]