20748081 has 4 divisors (see below), whose sum is σ = 27664112. Its totient is φ = 13832052.

The previous prime is 20748071. The next prime is 20748097. The reversal of 20748081 is 18084702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20748081 - 2⁶ = 20748017 is a prime.

It is a super-2 number, since 2×20748081² = 860965730365122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748071) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3458011 + ... + 3458016.

It is an arithmetic number, because the mean of its divisors is an integer number (6916028).

Almost surely, 2^20748081 is an apocalyptic number.

It is an amenable number.

20748081 is a deficient number, since it is larger than the sum of its proper divisors (6916031).

20748081 is an equidigital number, since it uses as much as digits as its factorization.

20748081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6916030.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20748081 is about 4555.0061470870. The cubic root of 20748081 is about 274.7847616076.

The spelling of 20748081 in words is "twenty million, seven hundred forty-eight thousand, eighty-one".