20138769 has 24 divisors (see below), whose sum is σ = 33388992. Its totient is φ = 11458080.

The previous prime is 20138743. The next prime is 20138801. The reversal of 20138769 is 96783102.

It is not a de Polignac number, because 20138769 - 2⁷ = 20138641 is a prime.

It is a super-2 number, since 2×20138769² = 811140033670722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20138269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17914 + ... + 19004.

It is an arithmetic number, because the mean of its divisors is an integer number (1391208).

Almost surely, 2^20138769 is an apocalyptic number.

It is an amenable number.

20138769 is a deficient number, since it is larger than the sum of its proper divisors (13250223).

20138769 is a wasteful number, since it uses less digits than its factorization.

20138769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397 (or 1394 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20138769 is about 4487.6239815742. The cubic root of 20138769 is about 272.0681102862.

The spelling of 20138769 in words is "twenty million, one hundred thirty-eight thousand, seven hundred sixty-nine".