20465890 has 32 divisors (see below), whose sum is σ = 38444544. Its totient is φ = 7835520.

The previous prime is 20465873. The next prime is 20465899. The reversal of 20465890 is 9856402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20465899) 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, 32862 + ... + 33478.

It is an arithmetic number, because the mean of its divisors is an integer number (1201392).

Almost surely, 2^20465890 is an apocalyptic number.

20465890 is a deficient number, since it is larger than the sum of its proper divisors (17978654).

20465890 is a wasteful number, since it uses less digits than its factorization.

20465890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 20465890 is about 4523.9241815044. The cubic root of 20465890 is about 273.5333043230.

The spelling of 20465890 in words is "twenty million, four hundred sixty-five thousand, eight hundred ninety".