20495887487 has 2 divisors, whose sum is σ = 20495887488. Its totient is φ = 20495887486.

The previous prime is 20495887403. The next prime is 20495887501. The reversal of 20495887487 is 78478859402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20495887487 - 2¹⁴ = 20495871103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20495887187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247943743 + 10247943744.

It is an arithmetic number, because the mean of its divisors is an integer number (10247943744).

Almost surely, 2^20495887487 is an apocalyptic number.

20495887487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495887487 is an equidigital number, since it uses as much as digits as its factorization.

20495887487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36126720, while the sum is 62.

The spelling of 20495887487 in words is "twenty billion, four hundred ninety-five million, eight hundred eighty-seven thousand, four hundred eighty-seven".