20513089 has 4 divisors (see below), whose sum is σ = 20523456. Its totient is φ = 20502724.

The previous prime is 20513083. The next prime is 20513093. The reversal of 20513089 is 98031502.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20513089 - 2⁵ = 20513057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20513083) 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, 1189 + ... + 6514.

It is an arithmetic number, because the mean of its divisors is an integer number (5130864).

Almost surely, 2^20513089 is an apocalyptic number.

It is an amenable number.

20513089 is a deficient number, since it is larger than the sum of its proper divisors (10367).

20513089 is an equidigital number, since it uses as much as digits as its factorization.

20513089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10366.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20513089 is about 4529.1377766635. The cubic root of 20513089 is about 273.7434195648.

The spelling of 20513089 in words is "twenty million, five hundred thirteen thousand, eighty-nine".