20420886 has 16 divisors (see below), whose sum is σ = 40949424. Its totient is φ = 6789024.

The previous prime is 20420867. The next prime is 20420891. The reversal of 20420886 is 68802402.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1905 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (2559339).

Almost surely, 2^20420886 is an apocalyptic number.

20420886 is an abundant number, since it is smaller than the sum of its proper divisors (20528538).

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

20420886 is a wasteful number, since it uses less digits than its factorization.

20420886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8975.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20420886 is about 4518.9474438192. The cubic root of 20420886 is about 273.3326594603.

The spelling of 20420886 in words is "twenty million, four hundred twenty thousand, eight hundred eighty-six".