20494672589 has 2 divisors, whose sum is σ = 20494672590. Its totient is φ = 20494672588.

The previous prime is 20494672577. The next prime is 20494672591. The reversal of 20494672589 is 98527649402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12439610089 + 8055062500 = 111533^2 + 89750^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494672589 - 2⁴ = 20494672573 is a prime.

Together with 20494672591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20494672559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247336294 + 10247336295.

It is an arithmetic number, because the mean of its divisors is an integer number (10247336295).

Almost surely, 2^20494672589 is an apocalyptic number.

It is an amenable number.

20494672589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494672589 is an equidigital number, since it uses as much as digits as its factorization.

20494672589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 20494672589 in words is "twenty billion, four hundred ninety-four million, six hundred seventy-two thousand, five hundred eighty-nine".