20688002 has 4 divisors (see below), whose sum is σ = 31032006. Its totient is φ = 10344000.

The previous prime is 20688001. The next prime is 20688007. The reversal of 20688002 is 20088602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19545241 + 1142761 = 4421^2 + 1069^2 .

It is not an unprimeable number, because it can be changed into a prime (20688001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5171999 + ... + 5172002.

Almost surely, 2^20688002 is an apocalyptic number.

20688002 is a deficient number, since it is larger than the sum of its proper divisors (10344004).

20688002 is a wasteful number, since it uses less digits than its factorization.

20688002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344003.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20688002 is about 4548.4065341612. The cubic root of 20688002 is about 274.5192791615.

The spelling of 20688002 in words is "twenty million, six hundred eighty-eight thousand, two".