20297131 has 2 divisors, whose sum is σ = 20297132. Its totient is φ = 20297130.

The previous prime is 20297041. The next prime is 20297143. The reversal of 20297131 is 13179202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20297131 - 2¹¹ = 20295083 is a prime.

It is a super-2 number, since 2×20297131² = 823947053662322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20297096 and 20297105.

It is not a weakly prime, because it can be changed into another prime (20297191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10148565 + 10148566.

It is an arithmetic number, because the mean of its divisors is an integer number (10148566).

Almost surely, 2^20297131 is an apocalyptic number.

20297131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20297131 is an equidigital number, since it uses as much as digits as its factorization.

20297131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 20297131 is about 4505.2337342251. The cubic root of 20297131 is about 272.7793885624.

The spelling of 20297131 in words is "twenty million, two hundred ninety-seven thousand, one hundred thirty-one".