20178116 has 24 divisors (see below), whose sum is σ = 42731136. Its totient is φ = 8138880.

The previous prime is 20178097. The next prime is 20178139. The reversal of 20178116 is 61187102.

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, 20720 + ... + 21671.

It is an arithmetic number, because the mean of its divisors is an integer number (1780464).

Almost surely, 2^20178116 is an apocalyptic number.

It is an amenable number.

20178116 is an abundant number, since it is smaller than the sum of its proper divisors (22553020).

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

20178116 is a wasteful number, since it uses less digits than its factorization.

20178116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42419 (or 42417 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 20178116 is about 4492.0057880639. The cubic root of 20178116 is about 272.2451833348.

The spelling of 20178116 in words is "twenty million, one hundred seventy-eight thousand, one hundred sixteen".