20138933 has 4 divisors (see below), whose sum is σ = 20788608. Its totient is φ = 19489260.

The previous prime is 20138903. The next prime is 20138939. The reversal of 20138933 is 33983102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20138933 - 2¹² = 20134837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20138896 and 20138905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138939) 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, 324791 + ... + 324852.

It is an arithmetic number, because the mean of its divisors is an integer number (5197152).

Almost surely, 2^20138933 is an apocalyptic number.

It is an amenable number.

20138933 is a deficient number, since it is larger than the sum of its proper divisors (649675).

20138933 is an equidigital number, since it uses as much as digits as its factorization.

20138933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649674.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20138933 is about 4487.6422540127. The cubic root of 20138933 is about 272.0688488128.

The spelling of 20138933 in words is "twenty million, one hundred thirty-eight thousand, nine hundred thirty-three".