20113230231978 has 16 divisors (see below), whose sum is σ = 43320803576736. Its totient is φ = 6188686225200.

The previous prime is 20113230231977. The next prime is 20113230232063. The reversal of 20113230231978 is 87913203231102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20113230231973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128930962948 + ... + 128930963103.

It is an arithmetic number, because the mean of its divisors is an integer number (2707550223546).

Almost surely, 2^{20113230231978} is an apocalyptic number.

20113230231978 is an abundant number, since it is smaller than the sum of its proper divisors (23207573344758).

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

20113230231978 is a wasteful number, since it uses less digits than its factorization.

20113230231978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257861926069.

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 20113230231978 in words is "twenty trillion, one hundred thirteen billion, two hundred thirty million, two hundred thirty-one thousand, nine hundred seventy-eight".