20110945 has 4 divisors (see below), whose sum is σ = 24133140. Its totient is φ = 16088752.

The previous prime is 20110927. The next prime is 20110957. The reversal of 20110945 is 54901102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54901102 = 2 ⋅27450551.

It can be written as a sum of positive squares in 2 ways, for example, as 8767521 + 11343424 = 2961^2 + 3368^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110945 - 2¹⁹ = 19586657 is a prime.

It is an unprimeable number.

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, 2011090 + ... + 2011099.

It is an arithmetic number, because the mean of its divisors is an integer number (6033285).

Almost surely, 2^20110945 is an apocalyptic number.

It is an amenable number.

20110945 is a deficient number, since it is larger than the sum of its proper divisors (4022195).

20110945 is an equidigital number, since it uses as much as digits as its factorization.

20110945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022194.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20110945 is about 4484.5228285738. The cubic root of 20110945 is about 271.9427548576.

The spelling of 20110945 in words is "twenty million, one hundred ten thousand, nine hundred forty-five".