20786434 has 8 divisors (see below), whose sum is σ = 32535360. Its totient is φ = 9941316.

The previous prime is 20786431. The next prime is 20786443. The reversal of 20786434 is 43468702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20786434.

It is not an unprimeable number, because it can be changed into a prime (20786431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225894 + ... + 225985.

It is an arithmetic number, because the mean of its divisors is an integer number (4066920).

Almost surely, 2^20786434 is an apocalyptic number.

20786434 is a deficient number, since it is larger than the sum of its proper divisors (11748926).

20786434 is a wasteful number, since it uses less digits than its factorization.

20786434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451904.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 20786434 is about 4559.2141866773. The cubic root of 20786434 is about 274.9539713597.

The spelling of 20786434 in words is "twenty million, seven hundred eighty-six thousand, four hundred thirty-four".