20848891 has 4 divisors (see below), whose sum is σ = 23827312. Its totient is φ = 17870472.

The previous prime is 20848837. The next prime is 20848897. The reversal of 20848891 is 19884802.

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 20848891 - 2⁹ = 20848379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20848897) 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, 1489200 + ... + 1489213.

It is an arithmetic number, because the mean of its divisors is an integer number (5956828).

Almost surely, 2^20848891 is an apocalyptic number.

20848891 is a deficient number, since it is larger than the sum of its proper divisors (2978421).

20848891 is an equidigital number, since it uses as much as digits as its factorization.

20848891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978420.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 20848891 is about 4566.0585848191. The cubic root of 20848891 is about 275.2290807433.

The spelling of 20848891 in words is "twenty million, eight hundred forty-eight thousand, eight hundred ninety-one".