20564854 has 4 divisors (see below), whose sum is σ = 30847284. Its totient is φ = 10282426.

The previous prime is 20564839. The next prime is 20564867. The reversal of 20564854 is 45846502.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5141212 + ... + 5141215.

It is an arithmetic number, because the mean of its divisors is an integer number (7711821).

Almost surely, 2^20564854 is an apocalyptic number.

20564854 is a deficient number, since it is larger than the sum of its proper divisors (10282430).

20564854 is a wasteful number, since it uses less digits than its factorization.

20564854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10282429.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 20564854 is about 4534.8488398181. The cubic root of 20564854 is about 273.9734909619.

The spelling of 20564854 in words is "twenty million, five hundred sixty-four thousand, eight hundred fifty-four".