1980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{11}}^1$

素因数の和:26

約数の個数: 36

約数和(自身を含む): 6552

約数和(自身を除く): 4572

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 90, 99, 110, 132, 165, 180, 198, 220, 330, 396, 495, 660, 990, 1980]

約数ペア:

[(1, 1980), (2, 990), (3, 660), (4, 495), (5, 396), (6, 330), (9, 220), (10, 198), (11, 180), (12, 165), (15, 132), (18, 110), (20, 99), (22, 90), (30, 66), (33, 60), (36, 55), (44, 45)]