20564522 has 16 divisors (see below), whose sum is σ = 33901632. Its totient is φ = 9277920.

The previous prime is 20564513. The next prime is 20564561. The reversal of 20564522 is 22546502.

It is a junction number, because it is equal to n+sod(n) for n = 20564491 and 20564500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398 + ... + 6425.

It is an arithmetic number, because the mean of its divisors is an integer number (2118852).

Almost surely, 2^20564522 is an apocalyptic number.

20564522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20564522 is a deficient number, since it is larger than the sum of its proper divisors (13337110).

20564522 is a wasteful number, since it uses less digits than its factorization.

20564522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20564522 is about 4534.8122342606. The cubic root of 20564522 is about 273.9720166069.

The spelling of 20564522 in words is "twenty million, five hundred sixty-four thousand, five hundred twenty-two".