20705386 has 8 divisors (see below), whose sum is σ = 33447204. Its totient is φ = 9556320.

The previous prime is 20705381. The next prime is 20705387. The reversal of 20705386 is 68350702.

It can be written as a sum of positive squares in 2 ways, for example, as 15093225 + 5612161 = 3885^2 + 2369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20705381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398155 + ... + 398206.

Almost surely, 2^20705386 is an apocalyptic number.

20705386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20705386 is a deficient number, since it is larger than the sum of its proper divisors (12741818).

20705386 is a wasteful number, since it uses less digits than its factorization.

20705386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796376.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20705386 is about 4550.3171318052. The cubic root of 20705386 is about 274.5961499177.

The spelling of 20705386 in words is "twenty million, seven hundred five thousand, three hundred eighty-six".