20785560 has 128 divisors (see below), whose sum is σ = 69050880. Its totient is φ = 4978688.

The previous prime is 20785529. The next prime is 20785573. The reversal of 20785560 is 6558702.

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 31 ways as a sum of consecutive naturals, for example, 46699 + ... + 47141.

It is an arithmetic number, because the mean of its divisors is an integer number (539460).

Almost surely, 2^20785560 is an apocalyptic number.

20785560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20785560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34525440).

20785560 is an abundant number, since it is smaller than the sum of its proper divisors (48265320).

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

20785560 is a wasteful number, since it uses less digits than its factorization.

20785560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 20785560 is about 4559.1183358189. The cubic root of 20785560 is about 274.9501176741.

The spelling of 20785560 in words is "twenty million, seven hundred eighty-five thousand, five hundred sixty".