20394851 has 8 divisors (see below), whose sum is σ = 20913984. Its totient is φ = 19879360.

The previous prime is 20394841. The next prime is 20394863. The reversal of 20394851 is 15849302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20394851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20394811) 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, 13031 + ... + 14511.

It is an arithmetic number, because the mean of its divisors is an integer number (2614248).

Almost surely, 2^20394851 is an apocalyptic number.

20394851 is a deficient number, since it is larger than the sum of its proper divisors (519133).

20394851 is a wasteful number, since it uses less digits than its factorization.

20394851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20394851 is about 4516.0658764017. The cubic root of 20394851 is about 273.2164509514.

The spelling of 20394851 in words is "twenty million, three hundred ninety-four thousand, eight hundred fifty-one".