20989348097 has 2 divisors, whose sum is σ = 20989348098. Its totient is φ = 20989348096.

The previous prime is 20989348063. The next prime is 20989348147. The reversal of 20989348097 is 79084398902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16872970816 + 4116377281 = 129896^2 + 64159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20989348097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20989348057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10494674048 + 10494674049.

It is an arithmetic number, because the mean of its divisors is an integer number (10494674049).

Almost surely, 2^20989348097 is an apocalyptic number.

It is an amenable number.

20989348097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20989348097 is an equidigital number, since it uses as much as digits as its factorization.

20989348097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 20989348097 in words is "twenty billion, nine hundred eighty-nine million, three hundred forty-eight thousand, ninety-seven".