20297591 has 8 divisors (see below), whose sum is σ = 21441024. Its totient is φ = 19184760.

The previous prime is 20297587. The next prime is 20297597. The reversal of 20297591 is 19579202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20297591 - 2² = 20297587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297597) 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 in 7 ways as a sum of consecutive naturals, for example, 6281 + ... + 8946.

It is an arithmetic number, because the mean of its divisors is an integer number (2680128).

Almost surely, 2^20297591 is an apocalyptic number.

20297591 is a deficient number, since it is larger than the sum of its proper divisors (1143433).

20297591 is a wasteful number, since it uses less digits than its factorization.

20297591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15301.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 20297591 is about 4505.2847856712. The cubic root of 20297591 is about 272.7814492406.

The spelling of 20297591 in words is "twenty million, two hundred ninety-seven thousand, five hundred ninety-one".