20117256 has 32 divisors (see below), whose sum is σ = 53252640. Its totient is φ = 6311168.

The previous prime is 20117243. The next prime is 20117261. The reversal of 20117256 is 65271102.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 24246 + ... + 25061.

It is an arithmetic number, because the mean of its divisors is an integer number (1664145).

Almost surely, 2^20117256 is an apocalyptic number.

It is an amenable number.

20117256 is an abundant number, since it is smaller than the sum of its proper divisors (33135384).

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

20117256 is a wasteful number, since it uses less digits than its factorization.

20117256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49333 (or 49329 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 20117256 is about 4485.2264156896. The cubic root of 20117256 is about 271.9711979306.

Adding to 20117256 its reverse (65271102), we get a palindrome (85388358).

The spelling of 20117256 in words is "twenty million, one hundred seventeen thousand, two hundred fifty-six".