20645341 has 2 divisors, whose sum is σ = 20645342. Its totient is φ = 20645340.

The previous prime is 20645321. The next prime is 20645347. The reversal of 20645341 is 14354602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 4605316 = 4005^2 + 2146^2 .

It is a cyclic number.

It is not a de Polignac number, because 20645341 - 2¹⁵ = 20612573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20645347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322670 + 10322671.

It is an arithmetic number, because the mean of its divisors is an integer number (10322671).

Almost surely, 2^20645341 is an apocalyptic number.

It is an amenable number.

20645341 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645341 is an equidigital number, since it uses as much as digits as its factorization.

20645341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20645341 is about 4543.7144496546. The cubic root of 20645341 is about 274.3304527072.

Adding to 20645341 its reverse (14354602), we get a palindrome (34999943).

The spelling of 20645341 in words is "twenty million, six hundred forty-five thousand, three hundred forty-one".