20954658671 has 2 divisors, whose sum is σ = 20954658672. Its totient is φ = 20954658670.

The previous prime is 20954658629. The next prime is 20954658679. The reversal of 20954658671 is 17685645902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20954658671 - 2⁶ = 20954658607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20954658679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477329335 + 10477329336.

It is an arithmetic number, because the mean of its divisors is an integer number (10477329336).

Almost surely, 2^20954658671 is an apocalyptic number.

20954658671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20954658671 is an equidigital number, since it uses as much as digits as its factorization.

20954658671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 20954658671 in words is "twenty billion, nine hundred fifty-four million, six hundred fifty-eight thousand, six hundred seventy-one".