20614991 has 2 divisors, whose sum is σ = 20614992. Its totient is φ = 20614990.

The previous prime is 20614987. The next prime is 20615041. The reversal of 20614991 is 19941602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20614991 - 2² = 20614987 is a prime.

It is a super-3 number, since 3×20614991³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20614961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307495 + 10307496.

It is an arithmetic number, because the mean of its divisors is an integer number (10307496).

Almost surely, 2^20614991 is an apocalyptic number.

20614991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20614991 is an equidigital number, since it uses as much as digits as its factorization.

20614991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20614991 is about 4540.3734427908. The cubic root of 20614991 is about 274.1959588851.

The spelling of 20614991 in words is "twenty million, six hundred fourteen thousand, nine hundred ninety-one".