20138900828 has 24 divisors (see below), whose sum is σ = 35349459264. Its totient is φ = 10039089600.

The previous prime is 20138900819. The next prime is 20138900897. The reversal of 20138900828 is 82800983102.

It is a happy number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 3205226 + ... + 3211502.

It is an arithmetic number, because the mean of its divisors is an integer number (1472894136).

Almost surely, 2^20138900828 is an apocalyptic number.

It is an amenable number.

20138900828 is a deficient number, since it is larger than the sum of its proper divisors (15210558436).

20138900828 is a wasteful number, since it uses less digits than its factorization.

20138900828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8573 (or 8571 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 20138900828 in words is "twenty billion, one hundred thirty-eight million, nine hundred thousand, eight hundred twenty-eight".