20950871 has 2 divisors, whose sum is σ = 20950872. Its totient is φ = 20950870.

The previous prime is 20950849. The next prime is 20950873. The reversal of 20950871 is 17805902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20950871 - 2¹⁸ = 20688727 is a prime.

Together with 20950873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20950873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10475435 + 10475436.

It is an arithmetic number, because the mean of its divisors is an integer number (10475436).

Almost surely, 2^20950871 is an apocalyptic number.

20950871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20950871 is an equidigital number, since it uses as much as digits as its factorization.

20950871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20950871 is about 4577.2121427786. The cubic root of 20950871 is about 275.6771017278.

The spelling of 20950871 in words is "twenty million, nine hundred fifty thousand, eight hundred seventy-one".