20713878 has 24 divisors (see below), whose sum is σ = 45183216. Its totient is φ = 6858000.

The previous prime is 20713873. The next prime is 20713907. The reversal of 20713878 is 87831702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1093 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (1882634).

Almost surely, 2^20713878 is an apocalyptic number.

20713878 is an abundant number, since it is smaller than the sum of its proper divisors (24469338).

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

20713878 is a wasteful number, since it uses less digits than its factorization.

20713878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780 (or 7777 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 20713878 is about 4551.2501579236. The cubic root of 20713878 is about 274.6336852686.

The spelling of 20713878 in words is "twenty million, seven hundred thirteen thousand, eight hundred seventy-eight".