20858091 has 8 divisors (see below), whose sum is σ = 27972240. Its totient is φ = 13824672.

The previous prime is 20858087. The next prime is 20858107. The reversal of 20858091 is 19085802.

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 20858091 - 2² = 20858087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20858011) 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, 19576 + ... + 20613.

It is an arithmetic number, because the mean of its divisors is an integer number (3496530).

Almost surely, 2^20858091 is an apocalyptic number.

20858091 is a deficient number, since it is larger than the sum of its proper divisors (7114149).

20858091 is a wasteful number, since it uses less digits than its factorization.

20858091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40365.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20858091 is about 4567.0659071224. The cubic root of 20858091 is about 275.2695582790.

The spelling of 20858091 in words is "twenty million, eight hundred fifty-eight thousand, ninety-one".