20631886 has 8 divisors (see below), whose sum is σ = 33761304. Its totient is φ = 9378120.

The previous prime is 20631869. The next prime is 20631899. The reversal of 20631886 is 68813602.

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

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, 468885 + ... + 468928.

It is an arithmetic number, because the mean of its divisors is an integer number (4220163).

Almost surely, 2^20631886 is an apocalyptic number.

20631886 is a deficient number, since it is larger than the sum of its proper divisors (13129418).

20631886 is a wasteful number, since it uses less digits than its factorization.

20631886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937826.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20631886 is about 4542.2335915274. The cubic root of 20631886 is about 274.2708441271.

The spelling of 20631886 in words is "twenty million, six hundred thirty-one thousand, eight hundred eighty-six".