20523864 has 32 divisors (see below), whose sum is σ = 51448320. Its totient is φ = 6822816.

The previous prime is 20523859. The next prime is 20523869. The reversal of 20523864 is 46832502.

It is an interprime number because it is at equal distance from previous prime (20523859) and next prime (20523869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523869) 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, 10189 + ... + 12035.

It is an arithmetic number, because the mean of its divisors is an integer number (1607760).

Almost surely, 2^20523864 is an apocalyptic number.

20523864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20523864 is an abundant number, since it is smaller than the sum of its proper divisors (30924456).

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

20523864 is a wasteful number, since it uses less digits than its factorization.

20523864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2315 counting only the distinct ones).

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

The square root of 20523864 is about 4530.3271405054. The cubic root of 20523864 is about 273.7913413096.

The spelling of 20523864 in words is "twenty million, five hundred twenty-three thousand, eight hundred sixty-four".