398000000

素因数分解:

$2^7\times 5^6\times {\mathrm{199}}^1$

素因数の和:243

約数の個数: 112

約数和(自身を含む): 996081000

約数和(自身を除く): 598081000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 199, 200, 250, 320, 398, 400, 500, 625, 640, 796, 800, 995, 1000, 1250, 1592, 1600, 1990, 2000, 2500, 3125, 3184, 3200, 3980, 4000, 4975, 5000, 6250, 6368, 7960, 8000, 9950, 10000, 12500, 12736, 15625, 15920, 16000, 19900, 20000, 24875, 25000, 25472, 31250, 31840, 39800, 40000, 49750, 50000, 62500, 63680, 79600, 80000, 99500, 100000, 124375, 125000, 127360, 159200, 199000, 200000, 248750, 250000, 318400, 398000, 400000, 497500, 500000, 621875, 636800, 796000, 995000, 1000000, 1243750, 1592000, 1990000, 2000000, 2487500, 3109375, 3184000, 3980000, 4975000, 6218750, 7960000, 9950000, 12437500, 15920000, 19900000, 24875000, 39800000, 49750000, 79600000, 99500000, 199000000, 398000000]

約数ペア:

[(1, 398000000), (2, 199000000), (4, 99500000), (5, 79600000), (8, 49750000), (10, 39800000), (16, 24875000), (20, 19900000), (25, 15920000), (32, 12437500), (40, 9950000), (50, 7960000), (64, 6218750), (80, 4975000), (100, 3980000), (125, 3184000), (128, 3109375), (160, 2487500), (199, 2000000), (200, 1990000), (250, 1592000), (320, 1243750), (398, 1000000), (400, 995000), (500, 796000), (625, 636800), (640, 621875), (796, 500000), (800, 497500), (995, 400000), (1000, 398000), (1250, 318400), (1592, 250000), (1600, 248750), (1990, 200000), (2000, 199000), (2500, 159200), (3125, 127360), (3184, 125000), (3200, 124375), (3980, 100000), (4000, 99500), (4975, 80000), (5000, 79600), (6250, 63680), (6368, 62500), (7960, 50000), (8000, 49750), (9950, 40000), (10000, 39800), (12500, 31840), (12736, 31250), (15625, 25472), (15920, 25000), (16000, 24875), (19900, 20000)]