20748880081 has 4 divisors (see below), whose sum is σ = 20998866672. Its totient is φ = 20498893492.

The previous prime is 20748880039. The next prime is 20748880093. The reversal of 20748880081 is 18008884702.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20748880081 - 2¹⁵ = 20748847313 is a prime.

It is a super-2 number, since 2×20748880081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748880021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124993171 + ... + 124993336.

It is an arithmetic number, because the mean of its divisors is an integer number (5249716668).

Almost surely, 2^20748880081 is an apocalyptic number.

It is an amenable number.

20748880081 is a deficient number, since it is larger than the sum of its proper divisors (249986591).

20748880081 is an equidigital number, since it uses as much as digits as its factorization.

20748880081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249986590.

The product of its (nonzero) digits is 229376, while the sum is 46.

The spelling of 20748880081 in words is "twenty billion, seven hundred forty-eight million, eight hundred eighty thousand, eighty-one".