20523164 has 6 divisors (see below), whose sum is σ = 35915544. Its totient is φ = 10261580.

The previous prime is 20523157. The next prime is 20523187. The reversal of 20523164 is 46132502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2565392 + ... + 2565399.

It is an arithmetic number, because the mean of its divisors is an integer number (5985924).

Almost surely, 2^20523164 is an apocalyptic number.

It is an amenable number.

20523164 is a deficient number, since it is larger than the sum of its proper divisors (15392380).

20523164 is a wasteful number, since it uses less digits than its factorization.

20523164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5130795 (or 5130793 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20523164 is about 4530.2498827327. The cubic root of 20523164 is about 273.7882285735.

Adding to 20523164 its reverse (46132502), we get a palindrome (66655666).

The spelling of 20523164 in words is "twenty million, five hundred twenty-three thousand, one hundred sixty-four".