20318004 has 36 divisors (see below), whose sum is σ = 58697184. Its totient is φ = 5805072.

The previous prime is 20318003. The next prime is 20318029. The reversal of 20318004 is 40081302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318003) 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 11 ways as a sum of consecutive naturals, for example, 40062 + ... + 40565.

Almost surely, 2^20318004 is an apocalyptic number.

It is an amenable number.

20318004 is an abundant number, since it is smaller than the sum of its proper divisors (38379180).

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

20318004 is a wasteful number, since it uses less digits than its factorization.

20318004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80644 (or 80639 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20318004 is about 4507.5496669477. The cubic root of 20318004 is about 272.8728627507.

Adding to 20318004 its reverse (40081302), we get a palindrome (60399306).

The spelling of 20318004 in words is "twenty million, three hundred eighteen thousand, four".