20080000

素因数分解:

$2^7\times 5^4\times {\mathrm{251}}^1$

素因数の和:285

約数の個数: 80

約数和(自身を含む): 50187060

約数和(自身を除く): 30107060

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 251, 320, 400, 500, 502, 625, 640, 800, 1000, 1004, 1250, 1255, 1600, 2000, 2008, 2500, 2510, 3200, 4000, 4016, 5000, 5020, 6275, 8000, 8032, 10000, 10040, 12550, 16000, 16064, 20000, 20080, 25100, 31375, 32128, 40000, 40160, 50200, 62750, 80000, 80320, 100400, 125500, 156875, 160640, 200800, 251000, 313750, 401600, 502000, 627500, 803200, 1004000, 1255000, 2008000, 2510000, 4016000, 5020000, 10040000, 20080000]

約数ペア:

[(1, 20080000), (2, 10040000), (4, 5020000), (5, 4016000), (8, 2510000), (10, 2008000), (16, 1255000), (20, 1004000), (25, 803200), (32, 627500), (40, 502000), (50, 401600), (64, 313750), (80, 251000), (100, 200800), (125, 160640), (128, 156875), (160, 125500), (200, 100400), (250, 80320), (251, 80000), (320, 62750), (400, 50200), (500, 40160), (502, 40000), (625, 32128), (640, 31375), (800, 25100), (1000, 20080), (1004, 20000), (1250, 16064), (1255, 16000), (1600, 12550), (2000, 10040), (2008, 10000), (2500, 8032), (2510, 8000), (3200, 6275), (4000, 5020), (4016, 5000)]