20432432989 has 2 divisors, whose sum is σ = 20432432990. Its totient is φ = 20432432988.

The previous prime is 20432432981. The next prime is 20432433013. The reversal of 20432432989 is 98923423402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11960703225 + 8471729764 = 109365^2 + 92042^2 .

It is a cyclic number.

It is not a de Polignac number, because 20432432989 - 2³ = 20432432981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20432432981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216216494 + 10216216495.

It is an arithmetic number, because the mean of its divisors is an integer number (10216216495).

Almost surely, 2^20432432989 is an apocalyptic number.

It is an amenable number.

20432432989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432432989 is an equidigital number, since it uses as much as digits as its factorization.

20432432989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 20432432989 in words is "twenty billion, four hundred thirty-two million, four hundred thirty-two thousand, nine hundred eighty-nine".