20044874989 has 2 divisors, whose sum is σ = 20044874990. Its totient is φ = 20044874988.

The previous prime is 20044874987. The next prime is 20044875007. The reversal of 20044874989 is 98947844002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16192562500 + 3852312489 = 127250^2 + 62067^2 .

It is a cyclic number.

It is not a de Polignac number, because 20044874989 - 2¹ = 20044874987 is a prime.

Together with 20044874987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20044874987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022437494 + 10022437495.

It is an arithmetic number, because the mean of its divisors is an integer number (10022437495).

Almost surely, 2^20044874989 is an apocalyptic number.

It is an amenable number.

20044874989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20044874989 is an equidigital number, since it uses as much as digits as its factorization.

20044874989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 20044874989 in words is "twenty billion, forty-four million, eight hundred seventy-four thousand, nine hundred eighty-nine".