20800000

素因数分解:

$2^9\times 5^5\times {\mathrm{13}}^1$

素因数の和:56

約数の個数: 120

約数和(自身を含む): 55941732

約数和(自身を除く): 35141732

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 32, 40, 50, 52, 64, 65, 80, 100, 104, 125, 128, 130, 160, 200, 208, 250, 256, 260, 320, 325, 400, 416, 500, 512, 520, 625, 640, 650, 800, 832, 1000, 1040, 1250, 1280, 1300, 1600, 1625, 1664, 2000, 2080, 2500, 2560, 2600, 3125, 3200, 3250, 3328, 4000, 4160, 5000, 5200, 6250, 6400, 6500, 6656, 8000, 8125, 8320, 10000, 10400, 12500, 12800, 13000, 16000, 16250, 16640, 20000, 20800, 25000, 26000, 32000, 32500, 33280, 40000, 40625, 41600, 50000, 52000, 64000, 65000, 80000, 81250, 83200, 100000, 104000, 130000, 160000, 162500, 166400, 200000, 208000, 260000, 320000, 325000, 400000, 416000, 520000, 650000, 800000, 832000, 1040000, 1300000, 1600000, 2080000, 2600000, 4160000, 5200000, 10400000, 20800000]

約数ペア:

[(1, 20800000), (2, 10400000), (4, 5200000), (5, 4160000), (8, 2600000), (10, 2080000), (13, 1600000), (16, 1300000), (20, 1040000), (25, 832000), (26, 800000), (32, 650000), (40, 520000), (50, 416000), (52, 400000), (64, 325000), (65, 320000), (80, 260000), (100, 208000), (104, 200000), (125, 166400), (128, 162500), (130, 160000), (160, 130000), (200, 104000), (208, 100000), (250, 83200), (256, 81250), (260, 80000), (320, 65000), (325, 64000), (400, 52000), (416, 50000), (500, 41600), (512, 40625), (520, 40000), (625, 33280), (640, 32500), (650, 32000), (800, 26000), (832, 25000), (1000, 20800), (1040, 20000), (1250, 16640), (1280, 16250), (1300, 16000), (1600, 13000), (1625, 12800), (1664, 12500), (2000, 10400), (2080, 10000), (2500, 8320), (2560, 8125), (2600, 8000), (3125, 6656), (3200, 6500), (3250, 6400), (3328, 6250), (4000, 5200), (4160, 5000)]