20683634 has 16 divisors (see below), whose sum is σ = 32140800. Its totient is φ = 9972480.

The previous prime is 20683631. The next prime is 20683661. The reversal of 20683634 is 43638602.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20683634.

It is not an unprimeable number, because it can be changed into a prime (20683631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27467 + ... + 28209.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^20683634 is an apocalyptic number.

20683634 is a deficient number, since it is larger than the sum of its proper divisors (11457166).

20683634 is a wasteful number, since it uses less digits than its factorization.

20683634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20683634 is about 4547.9263406524. The cubic root of 20683634 is about 274.4999574211.

The spelling of 20683634 in words is "twenty million, six hundred eighty-three thousand, six hundred thirty-four".