20741866687 has 2 divisors, whose sum is σ = 20741866688. Its totient is φ = 20741866686.

The previous prime is 20741866681. The next prime is 20741866697. The reversal of 20741866687 is 78666814702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20741866687 - 2³ = 20741866679 is a prime.

It is a super-2 number, since 2×20741866687² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20741866681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370933343 + 10370933344.

It is an arithmetic number, because the mean of its divisors is an integer number (10370933344).

Almost surely, 2^20741866687 is an apocalyptic number.

20741866687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20741866687 is an equidigital number, since it uses as much as digits as its factorization.

20741866687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5419008, while the sum is 55.

The spelling of 20741866687 in words is "twenty billion, seven hundred forty-one million, eight hundred sixty-six thousand, six hundred eighty-seven".