20322545 has 4 divisors (see below), whose sum is σ = 24387060. Its totient is φ = 16258032.

The previous prime is 20322539. The next prime is 20322559. The reversal of 20322545 is 54522302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54522302 = 2 ⋅27261151.

It can be written as a sum of positive squares in 2 ways, for example, as 4963984 + 15358561 = 2228^2 + 3919^2 .

It is a cyclic number.

It is not a de Polignac number, because 20322545 - 2⁶ = 20322481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20322545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032250 + ... + 2032259.

It is an arithmetic number, because the mean of its divisors is an integer number (6096765).

Almost surely, 2^20322545 is an apocalyptic number.

It is an amenable number.

20322545 is a deficient number, since it is larger than the sum of its proper divisors (4064515).

20322545 is an equidigital number, since it uses as much as digits as its factorization.

20322545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064514.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20322545 is about 4508.0533492850. The cubic root of 20322545 is about 272.8931899339.

Adding to 20322545 its reverse (54522302), we get a palindrome (74844847).

The spelling of 20322545 in words is "twenty million, three hundred twenty-two thousand, five hundred forty-five".