20479689 has 16 divisors (see below), whose sum is σ = 30795840. Its totient is φ = 13448160.

The previous prime is 20479681. The next prime is 20479703. The reversal of 20479689 is 98697402.

It is a happy number.

It is not a de Polignac number, because 20479689 - 2³ = 20479681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20479681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3852 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (1924740).

Almost surely, 2^20479689 is an apocalyptic number.

It is an amenable number.

20479689 is a deficient number, since it is larger than the sum of its proper divisors (10316151).

20479689 is a wasteful number, since it uses less digits than its factorization.

20479689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11397 (or 11391 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20479689 is about 4525.4490384933. The cubic root of 20479689 is about 273.5947665589.

The spelling of 20479689 in words is "twenty million, four hundred seventy-nine thousand, six hundred eighty-nine".