20223145 has 4 divisors (see below), whose sum is σ = 24267780. Its totient is φ = 16178512.

The previous prime is 20223139. The next prime is 20223167. The reversal of 20223145 is 54132202.

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 9803161 + 10419984 = 3131^2 + 3228^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223145 - 2²¹ = 18125993 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2022310 + ... + 2022319.

It is an arithmetic number, because the mean of its divisors is an integer number (6066945).

Almost surely, 2^20223145 is an apocalyptic number.

It is an amenable number.

20223145 is a deficient number, since it is larger than the sum of its proper divisors (4044635).

20223145 is an equidigital number, since it uses as much as digits as its factorization.

20223145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044634.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20223145 is about 4497.0151211665. The cubic root of 20223145 is about 272.4475448229.

Adding to 20223145 its reverse (54132202), we get a palindrome (74355347).

The spelling of 20223145 in words is "twenty million, two hundred twenty-three thousand, one hundred forty-five".