20728264 has 16 divisors (see below), whose sum is σ = 38915100. Its totient is φ = 10350912.

The previous prime is 20728249. The next prime is 20728271. The reversal of 20728264 is 46282702.

It can be written as a sum of positive squares in 2 ways, for example, as 17156164 + 3572100 = 4142^2 + 1890^2 .

It is a zygodrome in base 3.

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 in 3 ways as a sum of consecutive naturals, for example, 9202 + ... + 11230.

Almost surely, 2^20728264 is an apocalyptic number.

It is an amenable number.

20728264 is a deficient number, since it is larger than the sum of its proper divisors (18186836).

20728264 is a wasteful number, since it uses less digits than its factorization.

20728264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20728264 is about 4552.8303284880. The cubic root of 20728264 is about 274.6972491894.

The spelling of 20728264 in words is "twenty million, seven hundred twenty-eight thousand, two hundred sixty-four".