20687085 has 24 divisors (see below), whose sum is σ = 36694944. Its totient is φ = 10775520.

The previous prime is 20687081. The next prime is 20687087. The reversal of 20687085 is 58078602.

It is not a de Polignac number, because 20687085 - 2² = 20687081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3411 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (1528956).

Almost surely, 2^20687085 is an apocalyptic number.

It is an amenable number.

20687085 is a deficient number, since it is larger than the sum of its proper divisors (16007859).

20687085 is a wasteful number, since it uses less digits than its factorization.

20687085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745 (or 10742 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 20687085 is about 4548.3057285103. The cubic root of 20687085 is about 274.5152230601.

The spelling of 20687085 in words is "twenty million, six hundred eighty-seven thousand, eighty-five".