20430626549 has 2 divisors, whose sum is σ = 20430626550. Its totient is φ = 20430626548.

The previous prime is 20430626543. The next prime is 20430626561. The reversal of 20430626549 is 94562603402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20244167524 + 186459025 = 142282^2 + 13655^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430626549 - 2⁴ = 20430626533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430626543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215313274 + 10215313275.

It is an arithmetic number, because the mean of its divisors is an integer number (10215313275).

Almost surely, 2^20430626549 is an apocalyptic number.

It is an amenable number.

20430626549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430626549 is an equidigital number, since it uses as much as digits as its factorization.

20430626549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20430626549 in words is "twenty billion, four hundred thirty million, six hundred twenty-six thousand, five hundred forty-nine".