19910000

素因数分解:

$2^4\times 5^4\times {\mathrm{11}}^1\times {\mathrm{181}}^1$

素因数の和:220

約数の個数: 100

約数和(自身を含む): 52876824

約数和(自身を除く): 32966824

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 25, 40, 44, 50, 55, 80, 88, 100, 110, 125, 176, 181, 200, 220, 250, 275, 362, 400, 440, 500, 550, 625, 724, 880, 905, 1000, 1100, 1250, 1375, 1448, 1810, 1991, 2000, 2200, 2500, 2750, 2896, 3620, 3982, 4400, 4525, 5000, 5500, 6875, 7240, 7964, 9050, 9955, 10000, 11000, 13750, 14480, 15928, 18100, 19910, 22000, 22625, 27500, 31856, 36200, 39820, 45250, 49775, 55000, 72400, 79640, 90500, 99550, 110000, 113125, 159280, 181000, 199100, 226250, 248875, 362000, 398200, 452500, 497750, 796400, 905000, 995500, 1244375, 1810000, 1991000, 2488750, 3982000, 4977500, 9955000, 19910000]

約数ペア:

[(1, 19910000), (2, 9955000), (4, 4977500), (5, 3982000), (8, 2488750), (10, 1991000), (11, 1810000), (16, 1244375), (20, 995500), (22, 905000), (25, 796400), (40, 497750), (44, 452500), (50, 398200), (55, 362000), (80, 248875), (88, 226250), (100, 199100), (110, 181000), (125, 159280), (176, 113125), (181, 110000), (200, 99550), (220, 90500), (250, 79640), (275, 72400), (362, 55000), (400, 49775), (440, 45250), (500, 39820), (550, 36200), (625, 31856), (724, 27500), (880, 22625), (905, 22000), (1000, 19910), (1100, 18100), (1250, 15928), (1375, 14480), (1448, 13750), (1810, 11000), (1991, 10000), (2000, 9955), (2200, 9050), (2500, 7964), (2750, 7240), (2896, 6875), (3620, 5500), (3982, 5000), (4400, 4525)]