20390792 has 8 divisors (see below), whose sum is σ = 38232750. Its totient is φ = 10195392.

The previous prime is 20390767. The next prime is 20390827. The reversal of 20390792 is 29709302.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 1503076 = 4346^2 + 1226^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274417 + ... + 1274432.

Almost surely, 2^20390792 is an apocalyptic number.

It is an amenable number.

20390792 is a deficient number, since it is larger than the sum of its proper divisors (17841958).

20390792 is a wasteful number, since it uses less digits than its factorization.

20390792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548855 (or 2548851 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 20390792 is about 4515.6164584694. The cubic root of 20390792 is about 273.1983244947.

The spelling of 20390792 in words is "twenty million, three hundred ninety thousand, seven hundred ninety-two".