20138803 has 4 divisors (see below), whose sum is σ = 21198760. Its totient is φ = 19078848.

The previous prime is 20138801. The next prime is 20138819. The reversal of 20138803 is 30883102.

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 20138803 - 2¹ = 20138801 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20138801) 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 3 ways as a sum of consecutive naturals, for example, 529950 + ... + 529987.

It is an arithmetic number, because the mean of its divisors is an integer number (5299690).

Almost surely, 2^20138803 is an apocalyptic number.

20138803 is a deficient number, since it is larger than the sum of its proper divisors (1059957).

20138803 is a wasteful number, since it uses less digits than its factorization.

20138803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059956.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20138803 is about 4487.6277697688. The cubic root of 20138803 is about 272.0682633957.

It can be divided in two parts, 2013 and 8803, that added together give a square (10816 = 104²).

The spelling of 20138803 in words is "twenty million, one hundred thirty-eight thousand, eight hundred three".