20136971 has 2 divisors, whose sum is σ = 20136972. Its totient is φ = 20136970.

The previous prime is 20136967. The next prime is 20136973. The reversal of 20136971 is 17963102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20136971 - 2² = 20136967 is a prime.

Together with 20136973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20136973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10068485 + 10068486.

It is an arithmetic number, because the mean of its divisors is an integer number (10068486).

Almost surely, 2^20136971 is an apocalyptic number.

20136971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20136971 is an equidigital number, since it uses as much as digits as its factorization.

20136971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 20136971 is about 4487.4236483755. The cubic root of 20136971 is about 272.0600132501.

The spelling of 20136971 in words is "twenty million, one hundred thirty-six thousand, nine hundred seventy-one".