20712871 has 2 divisors, whose sum is σ = 20712872. Its totient is φ = 20712870.

The previous prime is 20712847. The next prime is 20712883. The reversal of 20712871 is 17821702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20712871 - 2²¹ = 18615719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712841) 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, 10356435 + 10356436.

It is an arithmetic number, because the mean of its divisors is an integer number (10356436).

Almost surely, 2^20712871 is an apocalyptic number.

20712871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712871 is an equidigital number, since it uses as much as digits as its factorization.

20712871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 20712871 is about 4551.1395276348. The cubic root of 20712871 is about 274.6292347805.

The spelling of 20712871 in words is "twenty million, seven hundred twelve thousand, eight hundred seventy-one".