20803137 has 4 divisors (see below), whose sum is σ = 27737520. Its totient is φ = 13868756.

The previous prime is 20803129. The next prime is 20803141. The reversal of 20803137 is 73130802.

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 20803137 - 2³ = 20803129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20803177) 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, 3467187 + ... + 3467192.

It is an arithmetic number, because the mean of its divisors is an integer number (6934380).

Almost surely, 2^20803137 is an apocalyptic number.

It is an amenable number.

20803137 is a deficient number, since it is larger than the sum of its proper divisors (6934383).

20803137 is an equidigital number, since it uses as much as digits as its factorization.

20803137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934382.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20803137 is about 4561.0456038062. The cubic root of 20803137 is about 275.0275983321.

Adding to 20803137 its reverse (73130802), we get a palindrome (93933939).

The spelling of 20803137 in words is "twenty million, eight hundred three thousand, one hundred thirty-seven".