20634886 has 4 divisors (see below), whose sum is σ = 30952332. Its totient is φ = 10317442.

The previous prime is 20634881. The next prime is 20634949. The reversal of 20634886 is 68843602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634881) 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 as a sum of consecutive naturals, namely, 5158720 + ... + 5158723.

It is an arithmetic number, because the mean of its divisors is an integer number (7738083).

Almost surely, 2^20634886 is an apocalyptic number.

20634886 is a deficient number, since it is larger than the sum of its proper divisors (10317446).

20634886 is a wasteful number, since it uses less digits than its factorization.

20634886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10317445.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20634886 is about 4542.5638135309. The cubic root of 20634886 is about 274.2841370249.

The spelling of 20634886 in words is "twenty million, six hundred thirty-four thousand, eight hundred eighty-six".