20878986 has 32 divisors (see below), whose sum is σ = 45872640. Its totient is φ = 6305904.

The previous prime is 20878981. The next prime is 20878987. The reversal of 20878986 is 68987802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20878981) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1360 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (1433520).

Almost surely, 2^20878986 is an apocalyptic number.

20878986 is an abundant number, since it is smaller than the sum of its proper divisors (24993654).

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

20878986 is a wasteful number, since it uses less digits than its factorization.

20878986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8010.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 20878986 is about 4569.3529082355. The cubic root of 20878986 is about 275.3614464874.

The spelling of 20878986 in words is "twenty million, eight hundred seventy-eight thousand, nine hundred eighty-six".