20465889 has 4 divisors (see below), whose sum is σ = 27287856. Its totient is φ = 13643924.

The previous prime is 20465873. The next prime is 20465899. The reversal of 20465889 is 98856402.

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.

It is a cyclic number.

It is not a de Polignac number, because 20465889 - 2⁴ = 20465873 is a prime.

It is a super-2 number, since 2×20465889² = 837705225120642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20465889.

It is not an unprimeable number, because it can be changed into a prime (20465839) 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, 3410979 + ... + 3410984.

It is an arithmetic number, because the mean of its divisors is an integer number (6821964).

Almost surely, 2^20465889 is an apocalyptic number.

It is an amenable number.

20465889 is a deficient number, since it is larger than the sum of its proper divisors (6821967).

20465889 is an equidigital number, since it uses as much as digits as its factorization.

20465889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821966.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20465889 is about 4523.9240709809. The cubic root of 20465889 is about 273.5332998679.

The spelling of 20465889 in words is "twenty million, four hundred sixty-five thousand, eight hundred eighty-nine".