20032805 has 16 divisors (see below), whose sum is σ = 26523504. Its totient is φ = 14430720.

The previous prime is 20032787. The next prime is 20032807. The reversal of 20032805 is 50823002.

It can be written as a sum of positive squares in 8 ways, for example, as 1560001 + 18472804 = 1249^2 + 4298^2 .

It is not a de Polignac number, because 20032805 - 2¹² = 20028709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20032807) 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, 1094 + ... + 6423.

It is an arithmetic number, because the mean of its divisors is an integer number (1657719).

Almost surely, 2^20032805 is an apocalyptic number.

It is an amenable number.

20032805 is a deficient number, since it is larger than the sum of its proper divisors (6490699).

20032805 is a wasteful number, since it uses less digits than its factorization.

20032805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20032805 is about 4475.8021627413. The cubic root of 20032805 is about 271.5900913729.

Adding to 20032805 its reverse (50823002), we get a palindrome (70855807).

The spelling of 20032805 in words is "twenty million, thirty-two thousand, eight hundred five".