20402703555887 has 2 divisors, whose sum is σ = 20402703555888. Its totient is φ = 20402703555886.

The previous prime is 20402703555863. The next prime is 20402703555889. The reversal of 20402703555887 is 78855530720402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20402703555887 is a prime.

Together with 20402703555889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402703555889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201351777943 + 10201351777944.

It is an arithmetic number, because the mean of its divisors is an integer number (10201351777944).

Almost surely, 2^{20402703555887} is an apocalyptic number.

20402703555887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402703555887 is an equidigital number, since it uses as much as digits as its factorization.

20402703555887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816000, while the sum is 56.

The spelling of 20402703555887 in words is "twenty trillion, four hundred two billion, seven hundred three million, five hundred fifty-five thousand, eight hundred eighty-seven".