20485889 has 4 divisors (see below), whose sum is σ = 20530224. Its totient is φ = 20441556.

The previous prime is 20485879. The next prime is 20485891. The reversal of 20485889 is 98858402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98858402 = 2 ⋅49429201.

It is a cyclic number.

It is not a de Polignac number, because 20485889 - 2²⁴ = 3708673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20485849) 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, 21467 + ... + 22400.

It is an arithmetic number, because the mean of its divisors is an integer number (5132556).

Almost surely, 2^20485889 is an apocalyptic number.

It is an amenable number.

20485889 is a deficient number, since it is larger than the sum of its proper divisors (44335).

20485889 is an equidigital number, since it uses as much as digits as its factorization.

20485889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44334.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 20485889 is about 4526.1340015514. The cubic root of 20485889 is about 273.6223730393.

The spelling of 20485889 in words is "twenty million, four hundred eighty-five thousand, eight hundred eighty-nine".