20207355081 has 4 divisors (see below), whose sum is σ = 26943140112. Its totient is φ = 13471570052.

The previous prime is 20207355073. The next prime is 20207355097. The reversal of 20207355081 is 18055370202.

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 20207355081 - 2³ = 20207355073 is a prime.

It is a super-2 number, since 2×20207355081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20207355011) 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, 3367892511 + ... + 3367892516.

It is an arithmetic number, because the mean of its divisors is an integer number (6735785028).

Almost surely, 2^20207355081 is an apocalyptic number.

It is an amenable number.

20207355081 is a deficient number, since it is larger than the sum of its proper divisors (6735785031).

20207355081 is an equidigital number, since it uses as much as digits as its factorization.

20207355081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735785030.

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 20207355081 in words is "twenty billion, two hundred seven million, three hundred fifty-five thousand, eighty-one".