20687336 has 16 divisors (see below), whose sum is σ = 38896800. Its totient is φ = 10314864.

The previous prime is 20687321. The next prime is 20687339. The reversal of 20687336 is 63378602.

It is a junction number, because it is equal to n+sod(n) for n = 20687296 and 20687305.

It is not an unprimeable number, because it can be changed into a prime (20687339) 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, 380 + ... + 6443.

It is an arithmetic number, because the mean of its divisors is an integer number (2431050).

Almost surely, 2^20687336 is an apocalyptic number.

It is an amenable number.

20687336 is a deficient number, since it is larger than the sum of its proper divisors (18209464).

20687336 is a wasteful number, since it uses less digits than its factorization.

20687336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7208 (or 7204 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20687336 is about 4548.3333211188. Note that the first 4 decimals coincide. The cubic root of 20687336 is about 274.5163333026.

The spelling of 20687336 in words is "twenty million, six hundred eighty-seven thousand, three hundred thirty-six".