20384381 has 2 divisors, whose sum is σ = 20384382. Its totient is φ = 20384380.

The previous prime is 20384363. The next prime is 20384387. The reversal of 20384381 is 18348302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 3648100 = 4091^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 20384381 - 2⁶ = 20384317 is a prime.

It is a super-2 number, since 2×20384381² = 831045977506322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20384387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10192190 + 10192191.

It is an arithmetic number, because the mean of its divisors is an integer number (10192191).

Almost surely, 2^20384381 is an apocalyptic number.

It is an amenable number.

20384381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20384381 is an equidigital number, since it uses as much as digits as its factorization.

20384381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20384381 is about 4514.9065328088. The cubic root of 20384381 is about 273.1696897062.

The spelling of 20384381 in words is "twenty million, three hundred eighty-four thousand, three hundred eighty-one".