20785878 has 12 divisors (see below), whose sum is σ = 45036108. Its totient is φ = 6928620.

The previous prime is 20785873. The next prime is 20785913. The reversal of 20785878 is 87858702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 577368 + ... + 577403.

It is an arithmetic number, because the mean of its divisors is an integer number (3753009).

Almost surely, 2^20785878 is an apocalyptic number.

20785878 is an abundant number, since it is smaller than the sum of its proper divisors (24250230).

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

20785878 is a wasteful number, since it uses less digits than its factorization.

20785878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154779 (or 1154776 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 20785878 is about 4559.1532108496. The cubic root of 20785878 is about 274.9515198285.

It can be divided in two parts, 207858 and 78, that added together give a square (207936 = 456²).

The spelling of 20785878 in words is "twenty million, seven hundred eighty-five thousand, eight hundred seventy-eight".