20384251 has 2 divisors, whose sum is σ = 20384252. Its totient is φ = 20384250.

The previous prime is 20384239. The next prime is 20384261. The reversal of 20384251 is 15248302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20384251 - 2¹⁵ = 20351483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20384261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10192125 + 10192126.

It is an arithmetic number, because the mean of its divisors is an integer number (10192126).

Almost surely, 2^20384251 is an apocalyptic number.

20384251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20384251 is an equidigital number, since it uses as much as digits as its factorization.

20384251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20384251 is about 4514.8921360316. The cubic root of 20384251 is about 273.1691089979.

The spelling of 20384251 in words is "twenty million, three hundred eighty-four thousand, two hundred fifty-one".