20786806 has 4 divisors (see below), whose sum is σ = 31180212. Its totient is φ = 10393402.

The previous prime is 20786797. The next prime is 20786807. The reversal of 20786806 is 60868702.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20786807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5196700 + ... + 5196703.

It is an arithmetic number, because the mean of its divisors is an integer number (7795053).

Almost surely, 2^20786806 is an apocalyptic number.

20786806 is a deficient number, since it is larger than the sum of its proper divisors (10393406).

20786806 is a wasteful number, since it uses less digits than its factorization.

20786806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10393405.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 20786806 is about 4559.2549829989. The cubic root of 20786806 is about 274.9556115683.

The spelling of 20786806 in words is "twenty million, seven hundred eighty-six thousand, eight hundred six".