20620615 has 4 divisors (see below), whose sum is σ = 24744744. Its totient is φ = 16496488.

The previous prime is 20620597. The next prime is 20620619. The reversal of 20620615 is 51602602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20620615 - 2⁵ = 20620583 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620619) 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, 2062057 + ... + 2062066.

It is an arithmetic number, because the mean of its divisors is an integer number (6186186).

Almost surely, 2^20620615 is an apocalyptic number.

20620615 is a deficient number, since it is larger than the sum of its proper divisors (4124129).

20620615 is an equidigital number, since it uses as much as digits as its factorization.

20620615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124128.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20620615 is about 4540.9927328724. The cubic root of 20620615 is about 274.2208911922.

The spelling of 20620615 in words is "twenty million, six hundred twenty thousand, six hundred fifteen".