20138900826 has 32 divisors (see below), whose sum is σ = 43969065408. Its totient is φ = 6098579840.

The previous prime is 20138900819. The next prime is 20138900897. The reversal of 20138900826 is 62800983102.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3651 + ... + 200726.

It is an arithmetic number, because the mean of its divisors is an integer number (1374033294).

Almost surely, 2^20138900826 is an apocalyptic number.

20138900826 is an abundant number, since it is smaller than the sum of its proper divisors (23830164582).

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

20138900826 is a wasteful number, since it uses less digits than its factorization.

20138900826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205886.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 20138900826 in words is "twenty billion, one hundred thirty-eight million, nine hundred thousand, eight hundred twenty-six".