20180000

素因数分解:

$2^5\times 5^4\times {\mathrm{1009}}^1$

素因数の和:1039

約数の個数: 60

約数和(自身を含む): 49695030

約数和(自身を除く): 29515030

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 625, 800, 1000, 1009, 1250, 2000, 2018, 2500, 4000, 4036, 5000, 5045, 8072, 10000, 10090, 16144, 20000, 20180, 25225, 32288, 40360, 50450, 80720, 100900, 126125, 161440, 201800, 252250, 403600, 504500, 630625, 807200, 1009000, 1261250, 2018000, 2522500, 4036000, 5045000, 10090000, 20180000]

約数ペア:

[(1, 20180000), (2, 10090000), (4, 5045000), (5, 4036000), (8, 2522500), (10, 2018000), (16, 1261250), (20, 1009000), (25, 807200), (32, 630625), (40, 504500), (50, 403600), (80, 252250), (100, 201800), (125, 161440), (160, 126125), (200, 100900), (250, 80720), (400, 50450), (500, 40360), (625, 32288), (800, 25225), (1000, 20180), (1009, 20000), (1250, 16144), (2000, 10090), (2018, 10000), (2500, 8072), (4000, 5045), (4036, 5000)]