20162891 has 8 divisors (see below), whose sum is σ = 23666400. Its totient is φ = 16815168.

The previous prime is 20162887. The next prime is 20162897. The reversal of 20162891 is 19826102.

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

It is not a de Polignac number, because 20162891 - 2² = 20162887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20162897) 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 7 ways as a sum of consecutive naturals, for example, 38666 + ... + 39183.

It is an arithmetic number, because the mean of its divisors is an integer number (2958300).

Almost surely, 2^20162891 is an apocalyptic number.

20162891 is a deficient number, since it is larger than the sum of its proper divisors (3503509).

20162891 is an equidigital number, since it uses as much as digits as its factorization.

20162891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77893.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 20162891 is about 4490.3107910255. The cubic root of 20162891 is about 272.1766936924.

Adding to 20162891 its reverse (19826102), we get a palindrome (39988993).

The spelling of 20162891 in words is "twenty million, one hundred sixty-two thousand, eight hundred ninety-one".