12640000

素因数分解:

$2^8\times 5^4\times {\mathrm{79}}^1$

素因数の和:115

約数の個数: 90

約数和(自身を含む): 31927280

約数和(自身を除く): 19287280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 79, 80, 100, 125, 128, 158, 160, 200, 250, 256, 316, 320, 395, 400, 500, 625, 632, 640, 790, 800, 1000, 1250, 1264, 1280, 1580, 1600, 1975, 2000, 2500, 2528, 3160, 3200, 3950, 4000, 5000, 5056, 6320, 6400, 7900, 8000, 9875, 10000, 10112, 12640, 15800, 16000, 19750, 20000, 20224, 25280, 31600, 32000, 39500, 40000, 49375, 50560, 63200, 79000, 80000, 98750, 101120, 126400, 158000, 160000, 197500, 252800, 316000, 395000, 505600, 632000, 790000, 1264000, 1580000, 2528000, 3160000, 6320000, 12640000]

約数ペア:

[(1, 12640000), (2, 6320000), (4, 3160000), (5, 2528000), (8, 1580000), (10, 1264000), (16, 790000), (20, 632000), (25, 505600), (32, 395000), (40, 316000), (50, 252800), (64, 197500), (79, 160000), (80, 158000), (100, 126400), (125, 101120), (128, 98750), (158, 80000), (160, 79000), (200, 63200), (250, 50560), (256, 49375), (316, 40000), (320, 39500), (395, 32000), (400, 31600), (500, 25280), (625, 20224), (632, 20000), (640, 19750), (790, 16000), (800, 15800), (1000, 12640), (1250, 10112), (1264, 10000), (1280, 9875), (1580, 8000), (1600, 7900), (1975, 6400), (2000, 6320), (2500, 5056), (2528, 5000), (3160, 4000), (3200, 3950)]