1991000

素因数分解:

$2^3\times 5^3\times {\mathrm{11}}^1\times {\mathrm{181}}^1$

素因数の和:213

約数の個数: 64

約数和(自身を含む): 5110560

約数和(自身を除く): 3119560

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 25, 40, 44, 50, 55, 88, 100, 110, 125, 181, 200, 220, 250, 275, 362, 440, 500, 550, 724, 905, 1000, 1100, 1375, 1448, 1810, 1991, 2200, 2750, 3620, 3982, 4525, 5500, 7240, 7964, 9050, 9955, 11000, 15928, 18100, 19910, 22625, 36200, 39820, 45250, 49775, 79640, 90500, 99550, 181000, 199100, 248875, 398200, 497750, 995500, 1991000]

約数ペア:

[(1, 1991000), (2, 995500), (4, 497750), (5, 398200), (8, 248875), (10, 199100), (11, 181000), (20, 99550), (22, 90500), (25, 79640), (40, 49775), (44, 45250), (50, 39820), (55, 36200), (88, 22625), (100, 19910), (110, 18100), (125, 15928), (181, 11000), (200, 9955), (220, 9050), (250, 7964), (275, 7240), (362, 5500), (440, 4525), (500, 3982), (550, 3620), (724, 2750), (905, 2200), (1000, 1991), (1100, 1810), (1375, 1448)]