20117456 has 20 divisors (see below), whose sum is σ = 40672992. Its totient is φ = 9621216.

The previous prime is 20117441. The next prime is 20117473. The reversal of 20117456 is 65471102.

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, 26966 + ... + 27701.

Almost surely, 2^20117456 is an apocalyptic number.

It is an amenable number.

20117456 is an abundant number, since it is smaller than the sum of its proper divisors (20555536).

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

20117456 is a wasteful number, since it uses less digits than its factorization.

20117456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54698 (or 54692 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20117456 is about 4485.2487110527. The cubic root of 20117456 is about 271.9720992143.

Adding to 20117456 its reverse (65471102), we get a palindrome (85588558).

The spelling of 20117456 in words is "twenty million, one hundred seventeen thousand, four hundred fifty-six".