20351886 has 16 divisors (see below), whose sum is σ = 40837584. Its totient is φ = 6761664.

The previous prime is 20351843. The next prime is 20351899. The reversal of 20351886 is 68815302.

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, 3541 + ... + 7296.

It is an arithmetic number, because the mean of its divisors is an integer number (2552349).

Almost surely, 2^20351886 is an apocalyptic number.

20351886 is an abundant number, since it is smaller than the sum of its proper divisors (20485698).

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

20351886 is a wasteful number, since it uses less digits than its factorization.

20351886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11155.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20351886 is about 4511.3064626558. The cubic root of 20351886 is about 273.0244580859.

The spelling of 20351886 in words is "twenty million, three hundred fifty-one thousand, eight hundred eighty-six".