20856694 has 4 divisors (see below), whose sum is σ = 31285044. Its totient is φ = 10428346.

The previous prime is 20856679. The next prime is 20856709. The reversal of 20856694 is 49665802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20856679) and next prime (20856709).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5214172 + ... + 5214175.

It is an arithmetic number, because the mean of its divisors is an integer number (7821261).

Almost surely, 2^20856694 is an apocalyptic number.

20856694 is a deficient number, since it is larger than the sum of its proper divisors (10428350).

20856694 is a wasteful number, since it uses less digits than its factorization.

20856694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428349.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 20856694 is about 4566.9129617281. The cubic root of 20856694 is about 275.2634126197.

The spelling of 20856694 in words is "twenty million, eight hundred fifty-six thousand, six hundred ninety-four".