20688693 has 8 divisors (see below), whose sum is σ = 27628608. Its totient is φ = 13770624.

The previous prime is 20688691. The next prime is 20688697. The reversal of 20688693 is 39688602.

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

It is not a de Polignac number, because 20688693 - 2¹ = 20688691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3105 + ... + 7142.

It is an arithmetic number, because the mean of its divisors is an integer number (3453576).

Almost surely, 2^20688693 is an apocalyptic number.

It is an amenable number.

20688693 is a deficient number, since it is larger than the sum of its proper divisors (6939915).

20688693 is a wasteful number, since it uses less digits than its factorization.

20688693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10923.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20688693 is about 4548.4824941952. The cubic root of 20688693 is about 274.5223355338.

The spelling of 20688693 in words is "twenty million, six hundred eighty-eight thousand, six hundred ninety-three".