20747764 has 6 divisors (see below), whose sum is σ = 36308594. Its totient is φ = 10373880.

The previous prime is 20747737. The next prime is 20747767. The reversal of 20747764 is 46774702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16337764 + 4410000 = 4042^2 + 2100^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2593467 + ... + 2593474.

Almost surely, 2^20747764 is an apocalyptic number.

It is an amenable number.

20747764 is a deficient number, since it is larger than the sum of its proper divisors (15560830).

20747764 is a wasteful number, since it uses less digits than its factorization.

20747764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186945 (or 5186943 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 37.

The square root of 20747764 is about 4554.9713500746. The cubic root of 20747764 is about 274.7833621655.

The spelling of 20747764 in words is "twenty million, seven hundred forty-seven thousand, seven hundred sixty-four".