20381653 has 2 divisors, whose sum is σ = 20381654. Its totient is φ = 20381652.

The previous prime is 20381651. The next prime is 20381659. The reversal of 20381653 is 35618302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12552849 + 7828804 = 3543^2 + 2798^2 .

It is a cyclic number.

It is not a de Polignac number, because 20381653 - 2¹ = 20381651 is a prime.

Together with 20381651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20381651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190826 + 10190827.

It is an arithmetic number, because the mean of its divisors is an integer number (10190827).

Almost surely, 2^20381653 is an apocalyptic number.

It is an amenable number.

20381653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20381653 is an equidigital number, since it uses as much as digits as its factorization.

20381653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20381653 is about 4514.6044123489. The cubic root of 20381653 is about 273.1575032490.

Adding to 20381653 its reverse (35618302), we get a palindrome (55999955).

The spelling of 20381653 in words is "twenty million, three hundred eighty-one thousand, six hundred fifty-three".