19980

素因数分解:

$2^2\times 3^3\times 5^1\times {\mathrm{37}}^1$

素因数の和:55

約数の個数: 48

約数和(自身を含む): 63840

約数和(自身を除く): 43860

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 37, 45, 54, 60, 74, 90, 108, 111, 135, 148, 180, 185, 222, 270, 333, 370, 444, 540, 555, 666, 740, 999, 1110, 1332, 1665, 1998, 2220, 3330, 3996, 4995, 6660, 9990, 19980]

約数ペア:

[(1, 19980), (2, 9990), (3, 6660), (4, 4995), (5, 3996), (6, 3330), (9, 2220), (10, 1998), (12, 1665), (15, 1332), (18, 1110), (20, 999), (27, 740), (30, 666), (36, 555), (37, 540), (45, 444), (54, 370), (60, 333), (74, 270), (90, 222), (108, 185), (111, 180), (135, 148)]