18891212

素因数分解:

$2^2\times {\mathrm{61}}^1\times {\mathrm{139}}^1\times {\mathrm{557}}^1$

素因数の和:761

約数の個数: 24

約数和(自身を含む): 33904080

約数和(自身を除く): 15012868

約数列:

[1, 2, 4, 61, 122, 139, 244, 278, 556, 557, 1114, 2228, 8479, 16958, 33916, 33977, 67954, 77423, 135908, 154846, 309692, 4722803, 9445606, 18891212]

約数ペア:

[(1, 18891212), (2, 9445606), (4, 4722803), (61, 309692), (122, 154846), (139, 135908), (244, 77423), (278, 67954), (556, 33977), (557, 33916), (1114, 16958), (2228, 8479)]