20430851 has 8 divisors (see below), whose sum is σ = 23564640. Its totient is φ = 17350848.

The previous prime is 20430841. The next prime is 20430857. The reversal of 20430851 is 15803402.

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-20430851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430857) 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, 12626 + ... + 14151.

It is an arithmetic number, because the mean of its divisors is an integer number (2945580).

Almost surely, 2^20430851 is an apocalyptic number.

20430851 is a deficient number, since it is larger than the sum of its proper divisors (3133789).

20430851 is a wasteful number, since it uses less digits than its factorization.

20430851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26893.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20430851 is about 4520.0498891052. The cubic root of 20430851 is about 273.3771125923.

The spelling of 20430851 in words is "twenty million, four hundred thirty thousand, eight hundred fifty-one".