20636764 has 12 divisors (see below), whose sum is σ = 36154944. Its totient is φ = 10306784.

The previous prime is 20636761. The next prime is 20636767. The reversal of 20636764 is 46763602.

It is an interprime number because it is at equal distance from previous prime (20636761) and next prime (20636767).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037 + ... + 6739.

It is an arithmetic number, because the mean of its divisors is an integer number (3012912).

Almost surely, 2^20636764 is an apocalyptic number.

It is an amenable number.

20636764 is a deficient number, since it is larger than the sum of its proper divisors (15518180).

20636764 is a wasteful number, since it uses less digits than its factorization.

20636764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5804 (or 5802 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 20636764 is about 4542.7705202883. The cubic root of 20636764 is about 274.2924577232.

The spelling of 20636764 in words is "twenty million, six hundred thirty-six thousand, seven hundred sixty-four".