20604626789 has 2 divisors, whose sum is σ = 20604626790. Its totient is φ = 20604626788.

The previous prime is 20604626771. The next prime is 20604626803. The reversal of 20604626789 is 98762640602.

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., 20175929764 + 428697025 = 142042^2 + 20705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20604626789 is a prime.

It is a super-2 number, since 2×20604626789² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20604626729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302313394 + 10302313395.

It is an arithmetic number, because the mean of its divisors is an integer number (10302313395).

Almost surely, 2^20604626789 is an apocalyptic number.

It is an amenable number.

20604626789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604626789 is an equidigital number, since it uses as much as digits as its factorization.

20604626789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 20604626789 in words is "twenty billion, six hundred four million, six hundred twenty-six thousand, seven hundred eighty-nine".