20773145 has 4 divisors (see below), whose sum is σ = 24927780. Its totient is φ = 16618512.

The previous prime is 20773139. The next prime is 20773147. The reversal of 20773145 is 54137702.

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 6492304 + 14280841 = 2548^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773145 - 2²⁰ = 19724569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20773147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077310 + ... + 2077319.

It is an arithmetic number, because the mean of its divisors is an integer number (6231945).

Almost surely, 2^20773145 is an apocalyptic number.

It is an amenable number.

20773145 is a deficient number, since it is larger than the sum of its proper divisors (4154635).

20773145 is an equidigital number, since it uses as much as digits as its factorization.

20773145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154634.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20773145 is about 4557.7565753340. The cubic root of 20773145 is about 274.8953651512.

The spelling of 20773145 in words is "twenty million, seven hundred seventy-three thousand, one hundred forty-five".