20004531 has 8 divisors (see below), whose sum is σ = 27393744. Its totient is φ = 12975840.

The previous prime is 20004527. The next prime is 20004533. The reversal of 20004531 is 13540002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20004531 - 2² = 20004527 is a prime.

It is a super-2 number, since 2×20004531² = 800362521059922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20004531.

It is not an unprimeable number, because it can be changed into a prime (20004533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90000 + ... + 90221.

It is an arithmetic number, because the mean of its divisors is an integer number (3424218).

Almost surely, 2^20004531 is an apocalyptic number.

20004531 is a deficient number, since it is larger than the sum of its proper divisors (7389213).

20004531 is a wasteful number, since it uses less digits than its factorization.

20004531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180261.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20004531 is about 4472.6425075116. The cubic root of 20004531 is about 271.4622584888.

Adding to 20004531 its reverse (13540002), we get a palindrome (33544533).

The spelling of 20004531 in words is "twenty million, four thousand, five hundred thirty-one".