20513053 has 4 divisors (see below), whose sum is σ = 22377888. Its totient is φ = 18648220.

The previous prime is 20513039. The next prime is 20513057. The reversal of 20513053 is 35031502.

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 20513053 - 2¹⁷ = 20381981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20513053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513057) 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, 932401 + ... + 932422.

It is an arithmetic number, because the mean of its divisors is an integer number (5594472).

Almost surely, 2^20513053 is an apocalyptic number.

It is an amenable number.

20513053 is a deficient number, since it is larger than the sum of its proper divisors (1864835).

20513053 is a wasteful number, since it uses less digits than its factorization.

20513053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864834.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 20513053 is about 4529.1338023953. The cubic root of 20513053 is about 273.7432594269.

Adding to 20513053 its reverse (35031502), we get a palindrome (55544555).

The spelling of 20513053 in words is "twenty million, five hundred thirteen thousand, fifty-three".