12820000

素因数分解:

$2^5\times 5^4\times {\mathrm{641}}^1$

素因数の和:671

約数の個数: 60

約数和(自身を含む): 31588326

約数和(自身を除く): 18768326

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 625, 641, 800, 1000, 1250, 1282, 2000, 2500, 2564, 3205, 4000, 5000, 5128, 6410, 10000, 10256, 12820, 16025, 20000, 20512, 25640, 32050, 51280, 64100, 80125, 102560, 128200, 160250, 256400, 320500, 400625, 512800, 641000, 801250, 1282000, 1602500, 2564000, 3205000, 6410000, 12820000]

約数ペア:

[(1, 12820000), (2, 6410000), (4, 3205000), (5, 2564000), (8, 1602500), (10, 1282000), (16, 801250), (20, 641000), (25, 512800), (32, 400625), (40, 320500), (50, 256400), (80, 160250), (100, 128200), (125, 102560), (160, 80125), (200, 64100), (250, 51280), (400, 32050), (500, 25640), (625, 20512), (641, 20000), (800, 16025), (1000, 12820), (1250, 10256), (1282, 10000), (2000, 6410), (2500, 5128), (2564, 5000), (3205, 4000)]