20785634 has 8 divisors (see below), whose sum is σ = 32253660. Its totient is φ = 10034416.

The previous prime is 20785631. The next prime is 20785669. The reversal of 20785634 is 43658702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19333609 + 1452025 = 4397^2 + 1205^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20785594 and 20785603.

It is not an unprimeable number, because it can be changed into a prime (20785631) 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, 179129 + ... + 179244.

Almost surely, 2^20785634 is an apocalyptic number.

20785634 is a deficient number, since it is larger than the sum of its proper divisors (11468026).

20785634 is a wasteful number, since it uses less digits than its factorization.

20785634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358404.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20785634 is about 4559.1264514159. The cubic root of 20785634 is about 274.9504439629.

The spelling of 20785634 in words is "twenty million, seven hundred eighty-five thousand, six hundred thirty-four".