20879566 has 8 divisors (see below), whose sum is σ = 31558824. Its totient is φ = 10359960.

The previous prime is 20879531. The next prime is 20879567. The reversal of 20879566 is 66597802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20879567) 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, 39585 + ... + 40108.

It is an arithmetic number, because the mean of its divisors is an integer number (3944853).

Almost surely, 2^20879566 is an apocalyptic number.

20879566 is a deficient number, since it is larger than the sum of its proper divisors (10679258).

20879566 is a wasteful number, since it uses less digits than its factorization.

20879566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79826.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 20879566 is about 4569.4163741117. The cubic root of 20879566 is about 275.3639962307.

The spelling of 20879566 in words is "twenty million, eight hundred seventy-nine thousand, five hundred sixty-six".