20138767 has 8 divisors (see below), whose sum is σ = 22563792. Its totient is φ = 17812800.

The previous prime is 20138743. The next prime is 20138801. The reversal of 20138767 is 76783102.

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

It is a cyclic number.

It is not a de Polignac number, because 20138767 - 2¹⁵ = 20105999 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 (20138707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24334 + ... + 25147.

It is an arithmetic number, because the mean of its divisors is an integer number (2820474).

Almost surely, 2^20138767 is an apocalyptic number.

20138767 is a deficient number, since it is larger than the sum of its proper divisors (2425025).

20138767 is a wasteful number, since it uses less digits than its factorization.

20138767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49529.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20138767 is about 4487.6237587391. The cubic root of 20138767 is about 272.0681012798.

The spelling of 20138767 in words is "twenty million, one hundred thirty-eight thousand, seven hundred sixty-seven".