20159878 has 8 divisors (see below), whose sum is σ = 30507768. Its totient is φ = 9990624.

The previous prime is 20159861. The next prime is 20159897. The reversal of 20159878 is 87895102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20159878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44376 + ... + 44827.

It is an arithmetic number, because the mean of its divisors is an integer number (3813471).

Almost surely, 2^20159878 is an apocalyptic number.

20159878 is a deficient number, since it is larger than the sum of its proper divisors (10347890).

20159878 is a wasteful number, since it uses less digits than its factorization.

20159878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89318.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 20159878 is about 4489.9752783284. The cubic root of 20159878 is about 272.1631356296.

The spelling of 20159878 in words is "twenty million, one hundred fifty-nine thousand, eight hundred seventy-eight".