20691696 has 20 divisors (see below), whose sum is σ = 53453672. Its totient is φ = 6897216.

The previous prime is 20691691. The next prime is 20691701. The reversal of 20691696 is 69619602.

It is an interprime number because it is at equal distance from previous prime (20691691) and next prime (20691701).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691691) 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, 215491 + ... + 215586.

Almost surely, 2^20691696 is an apocalyptic number.

It is an amenable number.

20691696 is an abundant number, since it is smaller than the sum of its proper divisors (32761976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20691696 is a wasteful number, since it uses less digits than its factorization.

20691696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431088 (or 431082 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 20691696 is about 4548.8125923146. The cubic root of 20691696 is about 274.5356173570.

The spelling of 20691696 in words is "twenty million, six hundred ninety-one thousand, six hundred ninety-six".