20837474687 has 2 divisors, whose sum is σ = 20837474688. Its totient is φ = 20837474686.

The previous prime is 20837474659. The next prime is 20837474701. The reversal of 20837474687 is 78647473802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20837474687 - 2¹⁰ = 20837473663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20837674687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418737343 + 10418737344.

It is an arithmetic number, because the mean of its divisors is an integer number (10418737344).

Almost surely, 2^20837474687 is an apocalyptic number.

20837474687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20837474687 is an equidigital number, since it uses as much as digits as its factorization.

20837474687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12644352, while the sum is 56.

The spelling of 20837474687 in words is "twenty billion, eight hundred thirty-seven million, four hundred seventy-four thousand, six hundred eighty-seven".