20598891 has 8 divisors (see below), whose sum is σ = 27722304. Its totient is φ = 13604040.

The previous prime is 20598887. The next prime is 20598913. The reversal of 20598891 is 19889502.

It is a happy number.

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

It is not a de Polignac number, because 20598891 - 2² = 20598887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20598811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31765 + ... + 32406.

It is an arithmetic number, because the mean of its divisors is an integer number (3465288).

Almost surely, 2^20598891 is an apocalyptic number.

20598891 is a deficient number, since it is larger than the sum of its proper divisors (7123413).

20598891 is a wasteful number, since it uses less digits than its factorization.

20598891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64281.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 20598891 is about 4538.6001145728. The cubic root of 20598891 is about 274.1245593120.

The spelling of 20598891 in words is "twenty million, five hundred ninety-eight thousand, eight hundred ninety-one".