19991988

素因数分解:

$2^2\times 3^3\times {\mathrm{37}}^1\times {\mathrm{5003}}^1$

素因数の和:5053

約数の個数: 48

約数和(自身を含む): 53242560

約数和(自身を除く): 33250572

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 37, 54, 74, 108, 111, 148, 222, 333, 444, 666, 999, 1332, 1998, 3996, 5003, 10006, 15009, 20012, 30018, 45027, 60036, 90054, 135081, 180108, 185111, 270162, 370222, 540324, 555333, 740444, 1110666, 1665999, 2221332, 3331998, 4997997, 6663996, 9995994, 19991988]

約数ペア:

[(1, 19991988), (2, 9995994), (3, 6663996), (4, 4997997), (6, 3331998), (9, 2221332), (12, 1665999), (18, 1110666), (27, 740444), (36, 555333), (37, 540324), (54, 370222), (74, 270162), (108, 185111), (111, 180108), (148, 135081), (222, 90054), (333, 60036), (444, 45027), (666, 30018), (999, 20012), (1332, 15009), (1998, 10006), (3996, 5003)]