19995520

素因数分解:

$2^7\times 5^1\times {\mathrm{157}}^1\times {\mathrm{199}}^1$

素因数の和:375

約数の個数: 64

約数和(自身を含む): 48348000

約数和(自身を除く): 28352480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 157, 160, 199, 314, 320, 398, 628, 640, 785, 796, 995, 1256, 1570, 1592, 1990, 2512, 3140, 3184, 3980, 5024, 6280, 6368, 7960, 10048, 12560, 12736, 15920, 20096, 25120, 25472, 31243, 31840, 50240, 62486, 63680, 100480, 124972, 127360, 156215, 249944, 312430, 499888, 624860, 999776, 1249720, 1999552, 2499440, 3999104, 4998880, 9997760, 19995520]

約数ペア:

[(1, 19995520), (2, 9997760), (4, 4998880), (5, 3999104), (8, 2499440), (10, 1999552), (16, 1249720), (20, 999776), (32, 624860), (40, 499888), (64, 312430), (80, 249944), (128, 156215), (157, 127360), (160, 124972), (199, 100480), (314, 63680), (320, 62486), (398, 50240), (628, 31840), (640, 31243), (785, 25472), (796, 25120), (995, 20096), (1256, 15920), (1570, 12736), (1592, 12560), (1990, 10048), (2512, 7960), (3140, 6368), (3184, 6280), (3980, 5024)]