20458745 has 4 divisors (see below), whose sum is σ = 24550500. Its totient is φ = 16366992.

The previous prime is 20458741. The next prime is 20458747. The reversal of 20458745 is 54785402.

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 4048144 + 16410601 = 2012^2 + 4051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20458745 - 2² = 20458741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20458741) 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, 2045870 + ... + 2045879.

It is an arithmetic number, because the mean of its divisors is an integer number (6137625).

Almost surely, 2^20458745 is an apocalyptic number.

It is an amenable number.

20458745 is a deficient number, since it is larger than the sum of its proper divisors (4091755).

20458745 is an equidigital number, since it uses as much as digits as its factorization.

20458745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091754.

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 20458745 is about 4523.1344220573. The cubic root of 20458745 is about 273.5014688650.

The spelling of 20458745 in words is "twenty million, four hundred fifty-eight thousand, seven hundred forty-five".