20490996585 has 16 divisors (see below), whose sum is σ = 34211055744. Its totient is φ = 10453377792.

The previous prime is 20490996569. The next prime is 20490996599. The reversal of 20490996585 is 58569909402.

It is not a de Polignac number, because 20490996585 - 2⁴ = 20490996569 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29696752 + ... + 29697441.

It is an arithmetic number, because the mean of its divisors is an integer number (2138190984).

Almost surely, 2^20490996585 is an apocalyptic number.

It is an amenable number.

20490996585 is a deficient number, since it is larger than the sum of its proper divisors (13720059159).

20490996585 is a wasteful number, since it uses less digits than its factorization.

20490996585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59394224.

The product of its (nonzero) digits is 6998400, while the sum is 57.

The spelling of 20490996585 in words is "twenty billion, four hundred ninety million, nine hundred ninety-six thousand, five hundred eighty-five".