820000

素因数分解:

$2^5\times 5^4\times {\mathrm{41}}^1$

素因数の和:71

約数の個数: 60

約数和(自身を含む): 2066526

約数和(自身を除く): 1246526

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 41, 50, 80, 82, 100, 125, 160, 164, 200, 205, 250, 328, 400, 410, 500, 625, 656, 800, 820, 1000, 1025, 1250, 1312, 1640, 2000, 2050, 2500, 3280, 4000, 4100, 5000, 5125, 6560, 8200, 10000, 10250, 16400, 20000, 20500, 25625, 32800, 41000, 51250, 82000, 102500, 164000, 205000, 410000, 820000]

約数ペア:

[(1, 820000), (2, 410000), (4, 205000), (5, 164000), (8, 102500), (10, 82000), (16, 51250), (20, 41000), (25, 32800), (32, 25625), (40, 20500), (41, 20000), (50, 16400), (80, 10250), (82, 10000), (100, 8200), (125, 6560), (160, 5125), (164, 5000), (200, 4100), (205, 4000), (250, 3280), (328, 2500), (400, 2050), (410, 2000), (500, 1640), (625, 1312), (656, 1250), (800, 1025), (820, 1000)]