20636842 has 8 divisors (see below), whose sum is σ = 32301216. Its totient is φ = 9869772.

The previous prime is 20636813. The next prime is 20636867. The reversal of 20636842 is 24863602.

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

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, 224268 + ... + 224359.

It is an arithmetic number, because the mean of its divisors is an integer number (4037652).

Almost surely, 2^20636842 is an apocalyptic number.

20636842 is a deficient number, since it is larger than the sum of its proper divisors (11664374).

20636842 is a wasteful number, since it uses less digits than its factorization.

20636842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448652.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 20636842 is about 4542.7791053495. The cubic root of 20636842 is about 274.2928033004.

The spelling of 20636842 in words is "twenty million, six hundred thirty-six thousand, eight hundred forty-two".