20208131329 has 4 divisors (see below), whose sum is σ = 20298750976. Its totient is φ = 20117511684.

The previous prime is 20208131323. The next prime is 20208131351. The reversal of 20208131329 is 92313180202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92313180202 = 2 ⋅46156590101.

It is a cyclic number.

It is not a de Polignac number, because 20208131329 - 2⁵ = 20208131297 is a prime.

It is a super-2 number, since 2×20208131329² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20208131329.

It is not an unprimeable number, because it can be changed into a prime (20208131323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45309489 + ... + 45309934.

It is an arithmetic number, because the mean of its divisors is an integer number (5074687744).

Almost surely, 2^20208131329 is an apocalyptic number.

It is an amenable number.

20208131329 is a deficient number, since it is larger than the sum of its proper divisors (90619647).

20208131329 is an equidigital number, since it uses as much as digits as its factorization.

20208131329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90619646.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 20208131329 in words is "twenty billion, two hundred eight million, one hundred thirty-one thousand, three hundred twenty-nine".