520000

素因数分解:

$2^6\times 5^4\times {\mathrm{13}}^1$

素因数の和:45

約数の個数: 70

約数和(自身を含む): 1388618

約数和(自身を除く): 868618

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 32, 40, 50, 52, 64, 65, 80, 100, 104, 125, 130, 160, 200, 208, 250, 260, 320, 325, 400, 416, 500, 520, 625, 650, 800, 832, 1000, 1040, 1250, 1300, 1600, 1625, 2000, 2080, 2500, 2600, 3250, 4000, 4160, 5000, 5200, 6500, 8000, 8125, 10000, 10400, 13000, 16250, 20000, 20800, 26000, 32500, 40000, 52000, 65000, 104000, 130000, 260000, 520000]

約数ペア:

[(1, 520000), (2, 260000), (4, 130000), (5, 104000), (8, 65000), (10, 52000), (13, 40000), (16, 32500), (20, 26000), (25, 20800), (26, 20000), (32, 16250), (40, 13000), (50, 10400), (52, 10000), (64, 8125), (65, 8000), (80, 6500), (100, 5200), (104, 5000), (125, 4160), (130, 4000), (160, 3250), (200, 2600), (208, 2500), (250, 2080), (260, 2000), (320, 1625), (325, 1600), (400, 1300), (416, 1250), (500, 1040), (520, 1000), (625, 832), (650, 800)]