20138741906 has 8 divisors (see below), whose sum is σ = 30209576124. Its totient is φ = 10068883200.

The previous prime is 20138741899. The next prime is 20138741941. The reversal of 20138741906 is 60914783102.

It can be written as a sum of positive squares in 2 ways, for example, as 19982366881 + 156375025 = 141359^2 + 12505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189875 + ... + 276278.

Almost surely, 2^20138741906 is an apocalyptic number.

20138741906 is a deficient number, since it is larger than the sum of its proper divisors (10070834218).

20138741906 is a wasteful number, since it uses less digits than its factorization.

20138741906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487756.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 20138741906 in words is "twenty billion, one hundred thirty-eight million, seven hundred forty-one thousand, nine hundred six".