20780000

素因数分解:

$2^5\times 5^4\times {\mathrm{1039}}^1$

素因数の和:1069

約数の個数: 60

約数和(自身を含む): 51171120

約数和(自身を除く): 30391120

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, 1039, 1250, 2000, 2078, 2500, 4000, 4156, 5000, 5195, 8312, 10000, 10390, 16624, 20000, 20780, 25975, 33248, 41560, 51950, 83120, 103900, 129875, 166240, 207800, 259750, 415600, 519500, 649375, 831200, 1039000, 1298750, 2078000, 2597500, 4156000, 5195000, 10390000, 20780000]

約数ペア:

[(1, 20780000), (2, 10390000), (4, 5195000), (5, 4156000), (8, 2597500), (10, 2078000), (16, 1298750), (20, 1039000), (25, 831200), (32, 649375), (40, 519500), (50, 415600), (80, 259750), (100, 207800), (125, 166240), (160, 129875), (200, 103900), (250, 83120), (400, 51950), (500, 41560), (625, 33248), (800, 25975), (1000, 20780), (1039, 20000), (1250, 16624), (2000, 10390), (2078, 10000), (2500, 8312), (4000, 5195), (4156, 5000)]