20213045 has 4 divisors (see below), whose sum is σ = 24255660. Its totient is φ = 16170432.

The previous prime is 20212991. The next prime is 20213047. The reversal of 20213045 is 54031202.

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 9721924 + 10491121 = 3118^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213045 - 2¹⁶ = 20147509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021300 + ... + 2021309.

It is an arithmetic number, because the mean of its divisors is an integer number (6063915).

Almost surely, 2^20213045 is an apocalyptic number.

It is an amenable number.

20213045 is a deficient number, since it is larger than the sum of its proper divisors (4042615).

20213045 is an equidigital number, since it uses as much as digits as its factorization.

20213045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042614.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20213045 is about 4495.8920138277. The cubic root of 20213045 is about 272.4021813144.

Adding to 20213045 its reverse (54031202), we get a palindrome (74244247).

The spelling of 20213045 in words is "twenty million, two hundred thirteen thousand, forty-five".