20004372 has 18 divisors (see below), whose sum is σ = 50566698. Its totient is φ = 6668112.

The previous prime is 20004367. The next prime is 20004419. The reversal of 20004372 is 27340002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 767376 = 4386^2 + 876^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×20004372² = 800349798228768, which contains 22 as substring.

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

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 5 ways as a sum of consecutive naturals, for example, 277803 + ... + 277874.

It is an arithmetic number, because the mean of its divisors is an integer number (2809261).

Almost surely, 2^20004372 is an apocalyptic number.

It is an amenable number.

20004372 is an abundant number, since it is smaller than the sum of its proper divisors (30562326).

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

20004372 is a wasteful number, since it uses less digits than its factorization.

20004372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555687 (or 555682 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20004372 is about 4472.6247327492. The cubic root of 20004372 is about 271.4615392748.

Adding to 20004372 its reverse (27340002), we get a palindrome (47344374).

The spelling of 20004372 in words is "twenty million, four thousand, three hundred seventy-two".