20747265 has 96 divisors (see below), whose sum is σ = 44126208. Its totient is φ = 8131200.

The previous prime is 20747263. The next prime is 20747273. The reversal of 20747265 is 56274702.

It is not a de Polignac number, because 20747265 - 2¹ = 20747263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 in 95 ways as a sum of consecutive naturals, for example, 292180 + ... + 292250.

It is an arithmetic number, because the mean of its divisors is an integer number (459648).

Almost surely, 2^20747265 is an apocalyptic number.

It is an amenable number.

20747265 is an abundant number, since it is smaller than the sum of its proper divisors (23378943).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20747265 is a wasteful number, since it uses less digits than its factorization.

20747265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 20747265 is about 4554.9165744281. The cubic root of 20747265 is about 274.7811592294.

It can be divided in two parts, 20747 and 265, that added together give a palindrome (21012).

The spelling of 20747265 in words is "twenty million, seven hundred forty-seven thousand, two hundred sixty-five".