20384851 has 2 divisors, whose sum is σ = 20384852. Its totient is φ = 20384850.

The previous prime is 20384809. The next prime is 20384863. The reversal of 20384851 is 15848302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20384851 - 2¹⁵ = 20352083 is a prime.

It is not a weakly prime, because it can be changed into another prime (20384251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10192425 + 10192426.

It is an arithmetic number, because the mean of its divisors is an integer number (10192426).

Almost surely, 2^20384851 is an apocalyptic number.

20384851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20384851 is an equidigital number, since it uses as much as digits as its factorization.

20384851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20384851 is about 4514.9585823128. The cubic root of 20384851 is about 273.1717891693.

It can be divided in two parts, 2038 and 4851, that added together give a square (6889 = 83²).

The spelling of 20384851 in words is "twenty million, three hundred eighty-four thousand, eight hundred fifty-one".