20937705587 has 2 divisors, whose sum is σ = 20937705588. Its totient is φ = 20937705586.

The previous prime is 20937705583. The next prime is 20937705637. The reversal of 20937705587 is 78550773902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20937705587 - 2² = 20937705583 is a prime.

It is not a weakly prime, because it can be changed into another prime (20937705583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468852793 + 10468852794.

It is an arithmetic number, because the mean of its divisors is an integer number (10468852794).

Almost surely, 2^20937705587 is an apocalyptic number.

20937705587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20937705587 is an equidigital number, since it uses as much as digits as its factorization.

20937705587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3704400, while the sum is 53.

The spelling of 20937705587 in words is "twenty billion, nine hundred thirty-seven million, seven hundred five thousand, five hundred eighty-seven".