20558613 has 4 divisors (see below), whose sum is σ = 27411488. Its totient is φ = 13705740.

The previous prime is 20558591. The next prime is 20558617. The reversal of 20558613 is 31685502.

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 not a de Polignac number, because 20558613 - 2⁵ = 20558581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20558617) 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, 3426433 + ... + 3426438.

It is an arithmetic number, because the mean of its divisors is an integer number (6852872).

Almost surely, 2^20558613 is an apocalyptic number.

It is an amenable number.

20558613 is a deficient number, since it is larger than the sum of its proper divisors (6852875).

20558613 is an equidigital number, since it uses as much as digits as its factorization.

20558613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6852874.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 20558613 is about 4534.1606720539. The cubic root of 20558613 is about 273.9457730967.

The spelling of 20558613 in words is "twenty million, five hundred fifty-eight thousand, six hundred thirteen".