20510822687 has 2 divisors, whose sum is σ = 20510822688. Its totient is φ = 20510822686.

The previous prime is 20510822641. The next prime is 20510822747. The reversal of 20510822687 is 78622801502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20510822687 - 2¹⁶ = 20510757151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20510822287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10255411343 + 10255411344.

It is an arithmetic number, because the mean of its divisors is an integer number (10255411344).

Almost surely, 2^20510822687 is an apocalyptic number.

20510822687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20510822687 is an equidigital number, since it uses as much as digits as its factorization.

20510822687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 20510822687 in words is "twenty billion, five hundred ten million, eight hundred twenty-two thousand, six hundred eighty-seven".