20523616 has 24 divisors (see below), whose sum is σ = 41394024. Its totient is φ = 10010880.

The previous prime is 20523611. The next prime is 20523623. The reversal of 20523616 is 61632502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6510 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (1724751).

Almost surely, 2^20523616 is an apocalyptic number.

It is an amenable number.

20523616 is an abundant number, since it is smaller than the sum of its proper divisors (20870408).

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

20523616 is a wasteful number, since it uses less digits than its factorization.

20523616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15694 (or 15686 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20523616 is about 4530.2997693309. The cubic root of 20523616 is about 273.7902385198.

The spelling of 20523616 in words is "twenty million, five hundred twenty-three thousand, six hundred sixteen".