20803113 has 12 divisors (see below), whose sum is σ = 30782388. Its totient is φ = 13530240.

The previous prime is 20803091. The next prime is 20803129. The reversal of 20803113 is 31130802.

It can be written as a sum of positive squares in 2 ways, for example, as 660969 + 20142144 = 813^2 + 4488^2 .

It is not a de Polignac number, because 20803113 - 2⁸ = 20802857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20803163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27820 + ... + 28557.

It is an arithmetic number, because the mean of its divisors is an integer number (2565199).

Almost surely, 2^20803113 is an apocalyptic number.

It is an amenable number.

20803113 is a deficient number, since it is larger than the sum of its proper divisors (9979275).

20803113 is a wasteful number, since it uses less digits than its factorization.

20803113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56424 (or 56421 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20803113 is about 4561.0429728298. The cubic root of 20803113 is about 275.0274925682.

Adding to 20803113 its reverse (31130802), we get a palindrome (51933915).

The spelling of 20803113 in words is "twenty million, eight hundred three thousand, one hundred thirteen".