20785865940 has 144 divisors (see below), whose sum is σ = 73815356160. Its totient is φ = 4635164160.

The previous prime is 20785865939. The next prime is 20785865959. The reversal of 20785865940 is 4956858702.

20785865940 is a `hidden beast` number, since 2 + 0 + 7 + 8 + 586 + 59 + 4 + 0 = 666.

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 47 ways as a sum of consecutive naturals, for example, 149520 + ... + 252839.

It is an arithmetic number, because the mean of its divisors is an integer number (512606640).

Almost surely, 2^20785865940 is an apocalyptic number.

20785865940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20785865940 is an abundant number, since it is smaller than the sum of its proper divisors (53029490220).

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

20785865940 is a wasteful number, since it uses less digits than its factorization.

20785865940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402422 (or 402417 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 20785865940 in words is "twenty billion, seven hundred eighty-five million, eight hundred sixty-five thousand, nine hundred forty".