20297971 has 2 divisors, whose sum is σ = 20297972. Its totient is φ = 20297970.

The previous prime is 20297969. The next prime is 20298001. The reversal of 20297971 is 17979202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20297971 - 2¹ = 20297969 is a prime.

Together with 20297969, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20297971.

It is not a weakly prime, because it can be changed into another prime (20297671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10148985 + 10148986.

It is an arithmetic number, because the mean of its divisors is an integer number (10148986).

Almost surely, 2^20297971 is an apocalyptic number.

20297971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20297971 is an equidigital number, since it uses as much as digits as its factorization.

20297971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 20297971 is about 4505.3269581685. The cubic root of 20297971 is about 272.7831515166.

It can be divided in two parts, 2029 and 7971, that added together give a 4-th power (10000 = 10⁴).

The spelling of 20297971 in words is "twenty million, two hundred ninety-seven thousand, nine hundred seventy-one".