20538772 has 24 divisors (see below), whose sum is σ = 38556000. Its totient is φ = 9543456.

The previous prime is 20538691. The next prime is 20538773. The reversal of 20538772 is 27783502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20538773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1479 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (1606500).

Almost surely, 2^20538772 is an apocalyptic number.

It is an amenable number.

20538772 is a deficient number, since it is larger than the sum of its proper divisors (18017228).

20538772 is a wasteful number, since it uses less digits than its factorization.

20538772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175 (or 5173 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20538772 is about 4531.9721976199. The cubic root of 20538772 is about 273.8576168972.

The spelling of 20538772 in words is "twenty million, five hundred thirty-eight thousand, seven hundred seventy-two".