20979696 has 20 divisors (see below), whose sum is σ = 54197672. Its totient is φ = 6993216.

The previous prime is 20979691. The next prime is 20979697. The reversal of 20979696 is 69697902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 437077 = 20979696 / (2 + 0 + 9 + 7 + 9 + 6 + 9 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218491 + ... + 218586.

Almost surely, 2^20979696 is an apocalyptic number.

It is an amenable number.

20979696 is an abundant number, since it is smaller than the sum of its proper divisors (33217976).

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

20979696 is a wasteful number, since it uses less digits than its factorization.

20979696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437088 (or 437082 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 20979696 is about 4580.3598111939. The cubic root of 20979696 is about 275.8034727814.

The spelling of 20979696 in words is "twenty million, nine hundred seventy-nine thousand, six hundred ninety-six".