20422547989 has 2 divisors, whose sum is σ = 20422547990. Its totient is φ = 20422547988.

The previous prime is 20422547947. The next prime is 20422548019. The reversal of 20422547989 is 98974522402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20421839025 + 708964 = 142905^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422547989 - 2⁹ = 20422547477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422547909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211273994 + 10211273995.

It is an arithmetic number, because the mean of its divisors is an integer number (10211273995).

Almost surely, 2^20422547989 is an apocalyptic number.

It is an amenable number.

20422547989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422547989 is an equidigital number, since it uses as much as digits as its factorization.

20422547989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 20422547989 in words is "twenty billion, four hundred twenty-two million, five hundred forty-seven thousand, nine hundred eighty-nine".