20224891 has 4 divisors (see below), whose sum is σ = 20234952. Its totient is φ = 20214832.

The previous prime is 20224837. The next prime is 20224901. The reversal of 20224891 is 19842202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20224891 - 2¹³ = 20216699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20224801) 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, 865 + ... + 6418.

It is an arithmetic number, because the mean of its divisors is an integer number (5058738).

Almost surely, 2^20224891 is an apocalyptic number.

20224891 is a deficient number, since it is larger than the sum of its proper divisors (10061).

20224891 is an equidigital number, since it uses as much as digits as its factorization.

20224891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10060.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20224891 is about 4497.2092457434. The cubic root of 20224891 is about 272.4553853396.

It can be divided in two parts, 20224 and 891, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20224891 in words is "twenty million, two hundred twenty-four thousand, eight hundred ninety-one".