20044401251 has 4 divisors (see below), whose sum is σ = 22907887152. Its totient is φ = 17180915352.

The previous prime is 20044401239. The next prime is 20044401283. The reversal of 20044401251 is 15210444002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20044401251 - 2²² = 20040206947 is a prime.

It is a super-2 number, since 2×20044401251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20044401551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431742940 + ... + 1431742953.

It is an arithmetic number, because the mean of its divisors is an integer number (5726971788).

Almost surely, 2^20044401251 is an apocalyptic number.

20044401251 is a deficient number, since it is larger than the sum of its proper divisors (2863485901).

20044401251 is an equidigital number, since it uses as much as digits as its factorization.

20044401251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863485900.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 20044401251 its reverse (15210444002), we get a palindrome (35254845253).

The spelling of 20044401251 in words is "twenty billion, forty-four million, four hundred one thousand, two hundred fifty-one".