20444224251 has 24 divisors (see below), whose sum is σ = 29983485952. Its totient is φ = 12381692400.

The previous prime is 20444224231. The next prime is 20444224261. The reversal of 20444224251 is 15242244402.

It is not a de Polignac number, because 20444224251 - 2¹³ = 20444216059 is a prime.

It is a super-2 number, since 2×20444224251² (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 (20444224201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 514830 + ... + 553116.

Almost surely, 2^20444224251 is an apocalyptic number.

20444224251 is a deficient number, since it is larger than the sum of its proper divisors (9539261701).

20444224251 is a wasteful number, since it uses less digits than its factorization.

20444224251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39783 (or 39772 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 20444224251 its reverse (15242244402), we get a palindrome (35686468653).

The spelling of 20444224251 in words is "twenty billion, four hundred forty-four million, two hundred twenty-four thousand, two hundred fifty-one".