20144945 has 12 divisors (see below), whose sum is σ = 24666204. Its totient is φ = 15790080.

The previous prime is 20144923. The next prime is 20144951. The reversal of 20144945 is 54944102.

20144945 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 6 ways, for example, as 1620529 + 18524416 = 1273^2 + 4304^2 .

It is not a de Polignac number, because 20144945 - 2¹² = 20140849 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78257 + ... + 78513.

It is an arithmetic number, because the mean of its divisors is an integer number (2055517).

Almost surely, 2^20144945 is an apocalyptic number.

It is an amenable number.

20144945 is a deficient number, since it is larger than the sum of its proper divisors (4521259).

20144945 is an frugal number, since it uses more digits than its factorization.

20144945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20144945 is about 4488.3120435193. The cubic root of 20144945 is about 272.0959193496.

The spelling of 20144945 in words is "twenty million, one hundred forty-four thousand, nine hundred forty-five".