20506694 has 8 divisors (see below), whose sum is σ = 33126240. Its totient is φ = 9464616.

The previous prime is 20506693. The next prime is 20506723. The reversal of 20506694 is 49660502.

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

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 20506694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506693) 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, 394334 + ... + 394385.

It is an arithmetic number, because the mean of its divisors is an integer number (4140780).

Almost surely, 2^20506694 is an apocalyptic number.

20506694 is a deficient number, since it is larger than the sum of its proper divisors (12619546).

20506694 is a wasteful number, since it uses less digits than its factorization.

20506694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788734.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20506694 is about 4528.4317373678. The cubic root of 20506694 is about 273.7149699065.

The spelling of 20506694 in words is "twenty million, five hundred six thousand, six hundred ninety-four".