19972000

素因数分解:

$2^5\times 5^3\times {\mathrm{4993}}^1$

素因数の和:5018

約数の個数: 48

約数和(自身を含む): 49081032

約数和(自身を除く): 29109032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 800, 1000, 2000, 4000, 4993, 9986, 19972, 24965, 39944, 49930, 79888, 99860, 124825, 159776, 199720, 249650, 399440, 499300, 624125, 798880, 998600, 1248250, 1997200, 2496500, 3994400, 4993000, 9986000, 19972000]

約数ペア:

[(1, 19972000), (2, 9986000), (4, 4993000), (5, 3994400), (8, 2496500), (10, 1997200), (16, 1248250), (20, 998600), (25, 798880), (32, 624125), (40, 499300), (50, 399440), (80, 249650), (100, 199720), (125, 159776), (160, 124825), (200, 99860), (250, 79888), (400, 49930), (500, 39944), (800, 24965), (1000, 19972), (2000, 9986), (4000, 4993)]