20234157989 has 2 divisors, whose sum is σ = 20234157990. Its totient is φ = 20234157988.

The previous prime is 20234157949. The next prime is 20234157997. The reversal of 20234157989 is 98975143202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17525788225 + 2708369764 = 132385^2 + 52042^2 .

It is a cyclic number.

It is not a de Polignac number, because 20234157989 - 2²⁸ = 19965722533 is a prime.

It is a super-2 number, since 2×20234157989² (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 (20234157929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117078994 + 10117078995.

It is an arithmetic number, because the mean of its divisors is an integer number (10117078995).

Almost surely, 2^20234157989 is an apocalyptic number.

It is an amenable number.

20234157989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20234157989 is an equidigital number, since it uses as much as digits as its factorization.

20234157989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 20234157989 in words is "twenty billion, two hundred thirty-four million, one hundred fifty-seven thousand, nine hundred eighty-nine".