19988180

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{103}}^1\times {\mathrm{313}}^1$

素因数の和:456

約数の個数: 48

約数和(自身を含む): 43889664

約数和(自身を除く): 23901484

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 103, 124, 155, 206, 310, 313, 412, 515, 620, 626, 1030, 1252, 1565, 2060, 3130, 3193, 6260, 6386, 9703, 12772, 15965, 19406, 31930, 32239, 38812, 48515, 63860, 64478, 97030, 128956, 161195, 194060, 322390, 644780, 999409, 1998818, 3997636, 4997045, 9994090, 19988180]

約数ペア:

[(1, 19988180), (2, 9994090), (4, 4997045), (5, 3997636), (10, 1998818), (20, 999409), (31, 644780), (62, 322390), (103, 194060), (124, 161195), (155, 128956), (206, 97030), (310, 64478), (313, 63860), (412, 48515), (515, 38812), (620, 32239), (626, 31930), (1030, 19406), (1252, 15965), (1565, 12772), (2060, 9703), (3130, 6386), (3193, 6260)]