20660392 has 16 divisors (see below), whose sum is σ = 39683700. Its totient is φ = 10078080.

The previous prime is 20660377. The next prime is 20660399. The reversal of 20660392 is 29306602.

It can be written as a sum of positive squares in 2 ways, for example, as 14638276 + 6022116 = 3826^2 + 2454^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20660392.

It is not an unprimeable number, because it can be changed into a prime (20660399) 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, 31167 + ... + 31822.

Almost surely, 2^20660392 is an apocalyptic number.

It is an amenable number.

20660392 is a deficient number, since it is larger than the sum of its proper divisors (19023308).

20660392 is a wasteful number, since it uses less digits than its factorization.

20660392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63036 (or 63032 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20660392 is about 4545.3703919483. The cubic root of 20660392 is about 274.3971012339.

Adding to 20660392 its reverse (29306602), we get a palindrome (49966994).

The spelling of 20660392 in words is "twenty million, six hundred sixty thousand, three hundred ninety-two".