20138659967 has 4 divisors (see below), whose sum is σ = 20140269240. Its totient is φ = 20137050696.

The previous prime is 20138659951. The next prime is 20138660027. The reversal of 20138659967 is 76995683102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20138659967 - 2⁴ = 20138659951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138655967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785717 + ... + 810942.

It is an arithmetic number, because the mean of its divisors is an integer number (5035067310).

Almost surely, 2^20138659967 is an apocalyptic number.

20138659967 is a deficient number, since it is larger than the sum of its proper divisors (1609273).

20138659967 is a wasteful number, since it uses less digits than its factorization.

20138659967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609272.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 20138659967 in words is "twenty billion, one hundred thirty-eight million, six hundred fifty-nine thousand, nine hundred sixty-seven".