20539972 has 6 divisors (see below), whose sum is σ = 35944958. Its totient is φ = 10269984.

The previous prime is 20539963. The next prime is 20539979. The reversal of 20539972 is 27993502.

It can be written as a sum of positive squares in only one way, i.e., 16760836 + 3779136 = 4094^2 + 1944^2 .

It is not an unprimeable number, because it can be changed into a prime (20539979) by changing a digit.

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, 2567493 + ... + 2567500.

Almost surely, 2^20539972 is an apocalyptic number.

It is an amenable number.

20539972 is a deficient number, since it is larger than the sum of its proper divisors (15404986).

20539972 is a wasteful number, since it uses less digits than its factorization.

20539972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134997 (or 5134995 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 20539972 is about 4532.1045883783. The cubic root of 20539972 is about 273.8629502693.

The spelling of 20539972 in words is "twenty million, five hundred thirty-nine thousand, nine hundred seventy-two".