20660545 has 8 divisors (see below), whose sum is σ = 24886440. Its totient is φ = 16465920.

The previous prime is 20660527. The next prime is 20660567. The reversal of 20660545 is 54506602.

It can be written as a sum of positive squares in 4 ways, for example, as 804609 + 19855936 = 897^2 + 4456^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20660545 - 2¹⁵ = 20627777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6336 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (3110805).

Almost surely, 2^20660545 is an apocalyptic number.

It is an amenable number.

20660545 is a deficient number, since it is larger than the sum of its proper divisors (4225895).

20660545 is a wasteful number, since it uses less digits than its factorization.

20660545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15635.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20660545 is about 4545.3872222287. The cubic root of 20660545 is about 274.3977785791.

The spelling of 20660545 in words is "twenty million, six hundred sixty thousand, five hundred forty-five".