20468851 has 4 divisors (see below), whose sum is σ = 22043392. Its totient is φ = 18894312.

The previous prime is 20468849. The next prime is 20468857. The reversal of 20468851 is 15886402.

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

It is a cyclic number.

It is not a de Polignac number, because 20468851 - 2¹ = 20468849 is a prime.

It is a super-2 number, since 2×20468851² = 837947722520402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20468857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787251 + ... + 787276.

It is an arithmetic number, because the mean of its divisors is an integer number (5510848).

Almost surely, 2^20468851 is an apocalyptic number.

20468851 is a deficient number, since it is larger than the sum of its proper divisors (1574541).

20468851 is a wasteful number, since it uses less digits than its factorization.

20468851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574540.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20468851 is about 4524.2514297948. The cubic root of 20468851 is about 273.5464952642.

The spelling of 20468851 in words is "twenty million, four hundred sixty-eight thousand, eight hundred fifty-one".