20785683520 has 112 divisors (see below), whose sum is σ = 58391682048. Its totient is φ = 6896609280.

The previous prime is 20785683497. The next prime is 20785683563. The reversal of 20785683520 is 2538658702.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80227 + ... + 219106.

It is an arithmetic number, because the mean of its divisors is an integer number (521354304).

Almost surely, 2^20785683520 is an apocalyptic number.

20785683520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20785683520 is an abundant number, since it is smaller than the sum of its proper divisors (37605998528).

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

20785683520 is a wasteful number, since it uses less digits than its factorization.

20785683520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299388 (or 299378 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 20785683520 in words is "twenty billion, seven hundred eighty-five million, six hundred eighty-three thousand, five hundred twenty".