20463145 has 4 divisors (see below), whose sum is σ = 24555780. Its totient is φ = 16370512.

The previous prime is 20463139. The next prime is 20463181. The reversal of 20463145 is 54136402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 4173849 = 4036^2 + 2043^2 .

It is a cyclic number.

It is not a de Polignac number, because 20463145 - 2³ = 20463137 is a prime.

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, 2046310 + ... + 2046319.

It is an arithmetic number, because the mean of its divisors is an integer number (6138945).

Almost surely, 2^20463145 is an apocalyptic number.

It is an amenable number.

20463145 is a deficient number, since it is larger than the sum of its proper divisors (4092635).

20463145 is an equidigital number, since it uses as much as digits as its factorization.

20463145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092634.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20463145 is about 4523.6207842833. The cubic root of 20463145 is about 273.5210745023.

Adding to 20463145 its reverse (54136402), we get a palindrome (74599547).

The spelling of 20463145 in words is "twenty million, four hundred sixty-three thousand, one hundred forty-five".