20728760 has 32 divisors (see below), whose sum is σ = 50228640. Its totient is φ = 7653504.

The previous prime is 20728759. The next prime is 20728781. The reversal of 20728760 is 6782702.

It is a super-2 number, since 2×20728760² = 859362982275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19412 + ... + 20451.

It is an arithmetic number, because the mean of its divisors is an integer number (1569645).

Almost surely, 2^20728760 is an apocalyptic number.

20728760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20728760 is an abundant number, since it is smaller than the sum of its proper divisors (29499880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20728760 is a wasteful number, since it uses less digits than its factorization.

20728760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39887 (or 39883 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 20728760 is about 4552.8847997726. The cubic root of 20728760 is about 274.6994402195.

The spelling of 20728760 in words is "twenty million, seven hundred twenty-eight thousand, seven hundred sixty".