20467889 has 16 divisors (see below), whose sum is σ = 22767360. Its totient is φ = 18282240.

The previous prime is 20467877. The next prime is 20467891. The reversal of 20467889 is 98876402.

20467889 = 163² + 164² + ... + 403².

It is a cyclic number.

It is not a de Polignac number, because 20467889 - 2²⁰ = 19419313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20467819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84809 + ... + 85049.

It is an arithmetic number, because the mean of its divisors is an integer number (1422960).

Almost surely, 2^20467889 is an apocalyptic number.

It is an amenable number.

20467889 is a deficient number, since it is larger than the sum of its proper divisors (2299471).

20467889 is a wasteful number, since it uses less digits than its factorization.

20467889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 20467889 is about 4524.1451126152. The cubic root of 20467889 is about 273.5422097957.

The spelling of 20467889 in words is "twenty million, four hundred sixty-seven thousand, eight hundred eighty-nine".