20989348147 has 2 divisors, whose sum is σ = 20989348148. Its totient is φ = 20989348146.

The previous prime is 20989348097. The next prime is 20989348181. The reversal of 20989348147 is 74184398902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20989348147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20989342147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10494674073 + 10494674074.

It is an arithmetic number, because the mean of its divisors is an integer number (10494674074).

Almost surely, 2^20989348147 is an apocalyptic number.

20989348147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20989348147 is an equidigital number, since it uses as much as digits as its factorization.

20989348147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 20989348147 in words is "twenty billion, nine hundred eighty-nine million, three hundred forty-eight thousand, one hundred forty-seven".