20507483881 has 2 divisors, whose sum is σ = 20507483882. Its totient is φ = 20507483880.

The previous prime is 20507483879. The next prime is 20507483903. The reversal of 20507483881 is 18838470502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20026778256 + 480705625 = 141516^2 + 21925^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507483881 - 2¹ = 20507483879 is a prime.

It is a super-3 number, since 3×20507483881³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 20507483879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20507483281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253741940 + 10253741941.

It is an arithmetic number, because the mean of its divisors is an integer number (10253741941).

Almost surely, 2^20507483881 is an apocalyptic number.

It is an amenable number.

20507483881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507483881 is an equidigital number, since it uses as much as digits as its factorization.

20507483881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 20507483881 in words is "twenty billion, five hundred seven million, four hundred eighty-three thousand, eight hundred eighty-one".