20747264 has 22 divisors (see below), whose sum is σ = 41476314. Its totient is φ = 10373120.

The previous prime is 20747263. The next prime is 20747273. The reversal of 20747264 is 46274702.

It can be written as a sum of positive squares in only one way, i.e., 11505664 + 9241600 = 3392^2 + 3040^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20747264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107 + ... + 11154.

It is an arithmetic number, because the mean of its divisors is an integer number (1885287).

Almost surely, 2^20747264 is an apocalyptic number.

It is an amenable number.

20747264 is a deficient number, since it is larger than the sum of its proper divisors (20729050).

20747264 is an equidigital number, since it uses as much as digits as its factorization.

20747264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20281 (or 20263 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 20747264 is about 4554.9164646566. The cubic root of 20747264 is about 274.7811548147.

The spelling of 20747264 in words is "twenty million, seven hundred forty-seven thousand, two hundred sixty-four".