20109678 has 16 divisors (see below), whose sum is σ = 40901760. Its totient is φ = 6589496.

The previous prime is 20109667. The next prime is 20109707. The reversal of 20109678 is 87690102.

It is a congruent number.

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, 28050 + ... + 28757.

It is an arithmetic number, because the mean of its divisors is an integer number (2556360).

Almost surely, 2^20109678 is an apocalyptic number.

20109678 is an abundant number, since it is smaller than the sum of its proper divisors (20792082).

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

20109678 is a wasteful number, since it uses less digits than its factorization.

20109678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56871.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20109678 is about 4484.3815627130. The cubic root of 20109678 is about 271.9370438926.

The spelling of 20109678 in words is "twenty million, one hundred nine thousand, six hundred seventy-eight".