21388520

素因数分解:

$2^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{2687}}^1$

素因数の和:2897

約数の個数: 32

約数和(自身を含む): 48384000

約数和(自身を除く): 26995480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 199, 398, 796, 995, 1592, 1990, 2687, 3980, 5374, 7960, 10748, 13435, 21496, 26870, 53740, 107480, 534713, 1069426, 2138852, 2673565, 4277704, 5347130, 10694260, 21388520]

約数ペア:

[(1, 21388520), (2, 10694260), (4, 5347130), (5, 4277704), (8, 2673565), (10, 2138852), (20, 1069426), (40, 534713), (199, 107480), (398, 53740), (796, 26870), (995, 21496), (1592, 13435), (1990, 10748), (2687, 7960), (3980, 5374)]