20688895 has 8 divisors (see below), whose sum is σ = 24922656. Its totient is φ = 16487136.

The previous prime is 20688869. The next prime is 20688907. The reversal of 20688895 is 59888602.

It is a happy number.

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 20688895 - 2¹¹ = 20686847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6552 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (3115332).

Almost surely, 2^20688895 is an apocalyptic number.

20688895 is a deficient number, since it is larger than the sum of its proper divisors (4233761).

20688895 is a wasteful number, since it uses less digits than its factorization.

20688895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16001.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 20688895 is about 4548.5046993490. The cubic root of 20688895 is about 274.5232289901.

The spelling of 20688895 in words is "twenty million, six hundred eighty-eight thousand, eight hundred ninety-five".