81020180

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{2111}}^1$

素因数の和:2240

約数の個数: 48

約数和(自身を含む): 180956160

約数和(自身を除く): 99935980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 101, 190, 202, 380, 404, 505, 1010, 1919, 2020, 2111, 3838, 4222, 7676, 8444, 9595, 10555, 19190, 21110, 38380, 40109, 42220, 80218, 160436, 200545, 213211, 401090, 426422, 802180, 852844, 1066055, 2132110, 4051009, 4264220, 8102018, 16204036, 20255045, 40510090, 81020180]

約数ペア:

[(1, 81020180), (2, 40510090), (4, 20255045), (5, 16204036), (10, 8102018), (19, 4264220), (20, 4051009), (38, 2132110), (76, 1066055), (95, 852844), (101, 802180), (190, 426422), (202, 401090), (380, 213211), (404, 200545), (505, 160436), (1010, 80218), (1919, 42220), (2020, 40109), (2111, 38380), (3838, 21110), (4222, 19190), (7676, 10555), (8444, 9595)]