20620087 has 4 divisors (see below), whose sum is σ = 20969640. Its totient is φ = 20270536.

The previous prime is 20620081. The next prime is 20620097. The reversal of 20620087 is 78002602.

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 20620087 - 2³ = 20620079 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 (20620081) 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, 174688 + ... + 174805.

It is an arithmetic number, because the mean of its divisors is an integer number (5242410).

Almost surely, 2^20620087 is an apocalyptic number.

20620087 is a deficient number, since it is larger than the sum of its proper divisors (349553).

20620087 is an equidigital number, since it uses as much as digits as its factorization.

20620087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349552.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20620087 is about 4540.9345954330. The cubic root of 20620087 is about 274.2185506564.

Adding to 20620087 its reverse (78002602), we get a palindrome (98622689).

The spelling of 20620087 in words is "twenty million, six hundred twenty thousand, eighty-seven".