20985287000 has 32 divisors (see below), whose sum is σ = 49105573920. Its totient is φ = 8394114400.

The previous prime is 20985286997. The next prime is 20985287027. The reversal of 20985287000 is 78258902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10491644 + ... + 10493643.

It is an arithmetic number, because the mean of its divisors is an integer number (1534549185).

Almost surely, 2^20985287000 is an apocalyptic number.

20985287000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20985287000 is an abundant number, since it is smaller than the sum of its proper divisors (28120286920).

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

20985287000 is a wasteful number, since it uses less digits than its factorization.

20985287000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20985308 (or 20985294 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 20985287000 in words is "twenty billion, nine hundred eighty-five million, two hundred eighty-seven thousand".