20302891 has 4 divisors (see below), whose sum is σ = 23203312. Its totient is φ = 17402472.

The previous prime is 20302853. The next prime is 20302897. The reversal of 20302891 is 19820302.

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 20302891 - 2¹⁵ = 20270123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20302897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1450200 + ... + 1450213.

It is an arithmetic number, because the mean of its divisors is an integer number (5800828).

Almost surely, 2^20302891 is an apocalyptic number.

20302891 is a deficient number, since it is larger than the sum of its proper divisors (2900421).

20302891 is an equidigital number, since it uses as much as digits as its factorization.

20302891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900420.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20302891 is about 4505.8729453903. The cubic root of 20302891 is about 272.8051895926.

The spelling of 20302891 in words is "twenty million, three hundred two thousand, eight hundred ninety-one".