20699671 has 2 divisors, whose sum is σ = 20699672. Its totient is φ = 20699670.

The previous prime is 20699669. The next prime is 20699713. The reversal of 20699671 is 17699602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20699671 - 2¹ = 20699669 is a prime.

Together with 20699669, 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 (20699621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349835 + 10349836.

It is an arithmetic number, because the mean of its divisors is an integer number (10349836).

Almost surely, 2^20699671 is an apocalyptic number.

20699671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20699671 is an equidigital number, since it uses as much as digits as its factorization.

20699671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20699671 is about 4549.6891102580. The cubic root of 20699671 is about 274.5708833614.

The spelling of 20699671 in words is "twenty million, six hundred ninety-nine thousand, six hundred seventy-one".