20523066 has 32 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 6698496.

The previous prime is 20523053. The next prime is 20523077. The reversal of 20523066 is 66032502.

It is a Curzon 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 in 15 ways as a sum of consecutive naturals, for example, 104080 + ... + 104276.

It is an arithmetic number, because the mean of its divisors is an integer number (1309770).

Almost surely, 2^20523066 is an apocalyptic number.

20523066 is an abundant number, since it is smaller than the sum of its proper divisors (21389574).

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

20523066 is a wasteful number, since it uses less digits than its factorization.

20523066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20523066 is about 4530.2390665394. The cubic root of 20523066 is about 273.7877927848.

Adding to 20523066 its reverse (66032502), we get a palindrome (86555568).

The spelling of 20523066 in words is "twenty million, five hundred twenty-three thousand, sixty-six".