20585868990 has 64 divisors (see below), whose sum is σ = 53999861760. Its totient is φ = 4999979520.

The previous prime is 20585868967. The next prime is 20585869001. The reversal of 20585868990 is 9986858502.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 635230 + ... + 666849.

It is an arithmetic number, because the mean of its divisors is an integer number (843747840).

Almost surely, 2^20585868990 is an apocalyptic number.

20585868990 is an abundant number, since it is smaller than the sum of its proper divisors (33413992770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20585868990 is a wasteful number, since it uses less digits than its factorization.

20585868990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302137.

The product of its (nonzero) digits is 12441600, while the sum is 60.

The spelling of 20585868990 in words is "twenty billion, five hundred eighty-five million, eight hundred sixty-eight thousand, nine hundred ninety".