20214591 has 4 divisors (see below), whose sum is σ = 26952792. Its totient is φ = 13476392.

The previous prime is 20214587. The next prime is 20214611. The reversal of 20214591 is 19541202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20214591 - 2² = 20214587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20214541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3369096 + ... + 3369101.

It is an arithmetic number, because the mean of its divisors is an integer number (6738198).

Almost surely, 2^20214591 is an apocalyptic number.

20214591 is a deficient number, since it is larger than the sum of its proper divisors (6738201).

20214591 is an equidigital number, since it uses as much as digits as its factorization.

20214591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738200.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20214591 is about 4496.0639452748. The cubic root of 20214591 is about 272.4091260546.

Adding to 20214591 its reverse (19541202), we get a palindrome (39755793).

The spelling of 20214591 in words is "twenty million, two hundred fourteen thousand, five hundred ninety-one".