20185239678 has 32 divisors (see below), whose sum is σ = 41210004096. Its totient is φ = 6589654368.

The previous prime is 20185239647. The next prime is 20185239707. The reversal of 20185239678 is 87693258102.

It is a self number, because there is not a number n which added to its sum of digits gives 20185239678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75576 + ... + 214667.

It is an arithmetic number, because the mean of its divisors is an integer number (1287812628).

Almost surely, 2^20185239678 is an apocalyptic number.

20185239678 is an abundant number, since it is smaller than the sum of its proper divisors (21024764418).

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

20185239678 is a wasteful number, since it uses less digits than its factorization.

20185239678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290488.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 20185239678 in words is "twenty billion, one hundred eighty-five million, two hundred thirty-nine thousand, six hundred seventy-eight".