20728083 has 32 divisors (see below), whose sum is σ = 31352832. Its totient is φ = 12108800.

The previous prime is 20728079. The next prime is 20728087. The reversal of 20728083 is 38082702.

It is an interprime number because it is at equal distance from previous prime (20728079) and next prime (20728087).

It is a cyclic number.

It is not a de Polignac number, because 20728083 - 2² = 20728079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20728083.

It is not an unprimeable number, because it can be changed into a prime (20728087) 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 31 ways as a sum of consecutive naturals, for example, 47878 + ... + 48308.

It is an arithmetic number, because the mean of its divisors is an integer number (979776).

Almost surely, 2^20728083 is an apocalyptic number.

20728083 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20728083 is a deficient number, since it is larger than the sum of its proper divisors (10624749).

20728083 is a wasteful number, since it uses less digits than its factorization.

20728083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20728083 is about 4552.8104506997. The cubic root of 20728083 is about 274.6964496315.

The spelling of 20728083 in words is "twenty million, seven hundred twenty-eight thousand, eighty-three".