20718004 has 12 divisors (see below), whose sum is σ = 36306144. Its totient is φ = 10344824.

The previous prime is 20717993. The next prime is 20718011. The reversal of 20718004 is 40081702.

It is a congruent number.

It is an unprimeable number.

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, 177 + ... + 6439.

It is an arithmetic number, because the mean of its divisors is an integer number (3025512).

Almost surely, 2^20718004 is an apocalyptic number.

It is an amenable number.

20718004 is a deficient number, since it is larger than the sum of its proper divisors (15588140).

20718004 is a wasteful number, since it uses less digits than its factorization.

20718004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094 (or 7092 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20718004 is about 4551.7034174032. The cubic root of 20718004 is about 274.6519188309.

Adding to 20718004 its reverse (40081702), we get a palindrome (60799706).

The spelling of 20718004 in words is "twenty million, seven hundred eighteen thousand, four".