9780400

素因数分解:

$2^4\times 5^2\times 7^2\times {\mathrm{499}}^1$

素因数の和:531

約数の個数: 90

約数和(自身を含む): 27388500

約数和(自身を除く): 17608100

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 35, 40, 49, 50, 56, 70, 80, 98, 100, 112, 140, 175, 196, 200, 245, 280, 350, 392, 400, 490, 499, 560, 700, 784, 980, 998, 1225, 1400, 1960, 1996, 2450, 2495, 2800, 3493, 3920, 3992, 4900, 4990, 6986, 7984, 9800, 9980, 12475, 13972, 17465, 19600, 19960, 24451, 24950, 27944, 34930, 39920, 48902, 49900, 55888, 69860, 87325, 97804, 99800, 122255, 139720, 174650, 195608, 199600, 244510, 279440, 349300, 391216, 489020, 611275, 698600, 978040, 1222550, 1397200, 1956080, 2445100, 4890200, 9780400]

約数ペア:

[(1, 9780400), (2, 4890200), (4, 2445100), (5, 1956080), (7, 1397200), (8, 1222550), (10, 978040), (14, 698600), (16, 611275), (20, 489020), (25, 391216), (28, 349300), (35, 279440), (40, 244510), (49, 199600), (50, 195608), (56, 174650), (70, 139720), (80, 122255), (98, 99800), (100, 97804), (112, 87325), (140, 69860), (175, 55888), (196, 49900), (200, 48902), (245, 39920), (280, 34930), (350, 27944), (392, 24950), (400, 24451), (490, 19960), (499, 19600), (560, 17465), (700, 13972), (784, 12475), (980, 9980), (998, 9800), (1225, 7984), (1400, 6986), (1960, 4990), (1996, 4900), (2450, 3992), (2495, 3920), (2800, 3493)]