20639087 has 8 divisors (see below), whose sum is σ = 24348672. Its totient is φ = 17119800.

The previous prime is 20639077. The next prime is 20639093. The reversal of 20639087 is 78093602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20639087 - 2⁶ = 20639023 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 (20639057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47339 + ... + 47772.

It is an arithmetic number, because the mean of its divisors is an integer number (3043584).

Almost surely, 2^20639087 is an apocalyptic number.

20639087 is a deficient number, since it is larger than the sum of its proper divisors (3709585).

20639087 is an equidigital number, since it uses as much as digits as its factorization.

20639087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95149.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20639087 is about 4543.0261940693. The cubic root of 20639087 is about 274.3027493476.

It can be divided in two parts, 206 and 39087, that added together give a palindrome (39293).

The spelling of 20639087 in words is "twenty million, six hundred thirty-nine thousand, eighty-seven".