20538264 has 64 divisors (see below), whose sum is σ = 55468800. Its totient is φ = 6317696.

The previous prime is 20538239. The next prime is 20538283. The reversal of 20538264 is 46283502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15367 + ... + 16649.

It is an arithmetic number, because the mean of its divisors is an integer number (866700).

Almost surely, 2^20538264 is an apocalyptic number.

20538264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20538264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27734400).

20538264 is an abundant number, since it is smaller than the sum of its proper divisors (34930536).

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

20538264 is a wasteful number, since it uses less digits than its factorization.

20538264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1340 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20538264 is about 4531.9161510337. The cubic root of 20538264 is about 273.8553590404.

It can be divided in two parts, 20538 and 264, that added together give a palindrome (20802).

The spelling of 20538264 in words is "twenty million, five hundred thirty-eight thousand, two hundred sixty-four".