20244007989 has 18 divisors (see below), whose sum is σ = 30253102230. Its totient is φ = 13029146256.

The previous prime is 20244007937. The next prime is 20244007999. The reversal of 20244007989 is 98970044202.

It can be written as a sum of positive squares in only one way, i.e., 17451731025 + 2792276964 = 132105^2 + 52842^2 .

It is not a de Polignac number, because 20244007989 - 2²¹ = 20241910837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20244007909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2294224 + ... + 2303030.

Almost surely, 2^20244007989 is an apocalyptic number.

20244007989 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20244007989 is a deficient number, since it is larger than the sum of its proper divisors (10009094241).

20244007989 is an frugal number, since it uses more digits than its factorization.

20244007989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17649 (or 8839 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20244007989 in words is "twenty billion, two hundred forty-four million, seven thousand, nine hundred eighty-nine".