20352991 has 2 divisors, whose sum is σ = 20352992. Its totient is φ = 20352990.

The previous prime is 20352973. The next prime is 20353027. The reversal of 20352991 is 19925302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20352991 - 2⁷ = 20352863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20352191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10176495 + 10176496.

It is an arithmetic number, because the mean of its divisors is an integer number (10176496).

Almost surely, 2^20352991 is an apocalyptic number.

20352991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20352991 is an equidigital number, since it uses as much as digits as its factorization.

20352991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20352991 is about 4511.4289310594. The cubic root of 20352991 is about 273.0293992589.

The spelling of 20352991 in words is "twenty million, three hundred fifty-two thousand, nine hundred ninety-one".