20004442251 has 8 divisors (see below), whose sum is σ = 26707277520. Its totient is φ = 13318950912.

The previous prime is 20004442229. The next prime is 20004442253. The reversal of 20004442251 is 15224440002.

It is a happy number.

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

It is not a de Polignac number, because 20004442251 - 2⁵ = 20004442219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20004442253) 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, 4333290 + ... + 4337903.

It is an arithmetic number, because the mean of its divisors is an integer number (3338409690).

Almost surely, 2^20004442251 is an apocalyptic number.

20004442251 is a deficient number, since it is larger than the sum of its proper divisors (6702835269).

20004442251 is an equidigital number, since it uses as much as digits as its factorization.

20004442251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8671965.

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 20004442251 its reverse (15224440002), we get a palindrome (35228882253).

The spelling of 20004442251 in words is "twenty billion, four million, four hundred forty-two thousand, two hundred fifty-one".