20412928 has 20 divisors (see below), whose sum is σ = 40787010. Its totient is φ = 10206208.

The previous prime is 20412923. The next prime is 20412929. The reversal of 20412928 is 82921402.

It can be written as a sum of positive squares in only one way, i.e., 16908544 + 3504384 = 4112^2 + 1872^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20412896 and 20412905.

It is not an unprimeable number, because it can be changed into a prime (20412923) 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, 19423 + ... + 20446.

Almost surely, 2^20412928 is an apocalyptic number.

It is an amenable number.

20412928 is a deficient number, since it is larger than the sum of its proper divisors (20374082).

20412928 is an frugal number, since it uses more digits than its factorization.

20412928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39887 (or 39871 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20412928 is about 4518.0668432417. The cubic root of 20412928 is about 273.2971490206.

The spelling of 20412928 in words is "twenty million, four hundred twelve thousand, nine hundred twenty-eight".