20728006 has 16 divisors (see below), whose sum is σ = 33559344. Its totient is φ = 9545184.

The previous prime is 20727989. The next prime is 20728009. The reversal of 20728006 is 60082702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728009) 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 in 7 ways as a sum of consecutive naturals, for example, 19956 + ... + 20968.

It is an arithmetic number, because the mean of its divisors is an integer number (2097459).

Almost surely, 2^20728006 is an apocalyptic number.

20728006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20728006 is a deficient number, since it is larger than the sum of its proper divisors (12831338).

20728006 is a wasteful number, since it uses less digits than its factorization.

20728006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20728006 is about 4552.8019943766. The cubic root of 20728006 is about 274.6961094866.

The spelling of 20728006 in words is "twenty million, seven hundred twenty-eight thousand, six".