20800053 has 6 divisors (see below), whose sum is σ = 30044534. Its totient is φ = 13866696.

The previous prime is 20800033. The next prime is 20800081. The reversal of 20800053 is 35000802.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 7969329 = 3582^2 + 2823^2 .

It is not a de Polignac number, because 20800053 - 2¹⁰ = 20799029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20799999 and 20800035.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20800033) 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 5 ways as a sum of consecutive naturals, for example, 1155550 + ... + 1155567.

Almost surely, 2^20800053 is an apocalyptic number.

It is an amenable number.

20800053 is a deficient number, since it is larger than the sum of its proper divisors (9244481).

20800053 is a wasteful number, since it uses less digits than its factorization.

20800053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311123 (or 2311120 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20800053 is about 4560.7075109022. The cubic root of 20800053 is about 275.0140070000.

Adding to 20800053 its reverse (35000802), we get a palindrome (55800855).

The spelling of 20800053 in words is "twenty million, eight hundred thousand, fifty-three".