20470291 has 2 divisors, whose sum is σ = 20470292. Its totient is φ = 20470290.

The previous prime is 20470249. The next prime is 20470297. The reversal of 20470291 is 19207402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20470291 - 2¹⁷ = 20339219 is a prime.

It is equal to p_1298500 and since 20470291 and 1298500 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20470297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10235145 + 10235146.

It is an arithmetic number, because the mean of its divisors is an integer number (10235146).

Almost surely, 2^20470291 is an apocalyptic number.

20470291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20470291 is an equidigital number, since it uses as much as digits as its factorization.

20470291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20470291 is about 4524.4105693449. The cubic root of 20470291 is about 273.5529098519.

Adding to 20470291 its reverse (19207402), we get a palindrome (39677693).

The spelling of 20470291 in words is "twenty million, four hundred seventy thousand, two hundred ninety-one".