20634378 has 8 divisors (see below), whose sum is σ = 41268768. Its totient is φ = 6878124.

The previous prime is 20634377. The next prime is 20634389. The reversal of 20634378 is 87343602.

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

20634378 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20634373) 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 in 3 ways as a sum of consecutive naturals, for example, 1719526 + ... + 1719537.

It is an arithmetic number, because the mean of its divisors is an integer number (5158596).

Almost surely, 2^20634378 is an apocalyptic number.

20634378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20634378 is a wasteful number, since it uses less digits than its factorization.

20634378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439068.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20634378 is about 4542.5078976266. The cubic root of 20634378 is about 274.2818861848.

It can be divided in two parts, 20634 and 378, that added together give a palindrome (21012).

The spelling of 20634378 in words is "twenty million, six hundred thirty-four thousand, three hundred seventy-eight".