20252381 has 2 divisors, whose sum is σ = 20252382. Its totient is φ = 20252380.

The previous prime is 20252377. The next prime is 20252447. The reversal of 20252381 is 18325202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 2325625 = 4234^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20252381 - 2² = 20252377 is a prime.

It is a super-2 number, since 2×20252381² = 820317872338322, 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 (20252311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126190 + 10126191.

It is an arithmetic number, because the mean of its divisors is an integer number (10126191).

Almost surely, 2^20252381 is an apocalyptic number.

It is an amenable number.

20252381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20252381 is an equidigital number, since it uses as much as digits as its factorization.

20252381 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20252381 is about 4500.2645477794. The cubic root of 20252381 is about 272.5787713805.

Adding to 20252381 its reverse (18325202), we get a palindrome (38577583).

The spelling of 20252381 in words is "twenty million, two hundred fifty-two thousand, three hundred eighty-one".