20940928 has 16 divisors (see below), whose sum is σ = 41718510. Its totient is φ = 10470400.

The previous prime is 20940901. The next prime is 20940967. The reversal of 20940928 is 82904902.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 4359744 = 4072^2 + 2088^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 20940893 and 20940902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81673 + ... + 81928.

Almost surely, 2^20940928 is an apocalyptic number.

It is an amenable number.

20940928 is a deficient number, since it is larger than the sum of its proper divisors (20777582).

20940928 is an equidigital number, since it uses as much as digits as its factorization.

20940928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163615 (or 163603 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20940928 is about 4576.1258723947. The cubic root of 20940928 is about 275.6334839524.

The spelling of 20940928 in words is "twenty million, nine hundred forty thousand, nine hundred twenty-eight".