20217056 has 24 divisors (see below), whose sum is σ = 40161744. Its totient is φ = 10017280.

The previous prime is 20217019. The next prime is 20217077. The reversal of 20217056 is 65071202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (1673406).

Almost surely, 2^20217056 is an apocalyptic number.

It is an amenable number.

20217056 is a deficient number, since it is larger than the sum of its proper divisors (19944688).

20217056 is a wasteful number, since it uses less digits than its factorization.

20217056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714 (or 5706 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20217056 is about 4496.3380655818. The cubic root of 20217056 is about 272.4201982747.

Adding to 20217056 its reverse (65071202), we get a palindrome (85288258).

The spelling of 20217056 in words is "twenty million, two hundred seventeen thousand, fifty-six".