20301691 has 2 divisors, whose sum is σ = 20301692. Its totient is φ = 20301690.

The previous prime is 20301647. The next prime is 20301713. The reversal of 20301691 is 19610302.

It is an a-pointer prime, because the next prime (20301713) can be obtained adding 20301691 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20301691 - 2⁷ = 20301563 is a prime.

It is not a weakly prime, because it can be changed into another prime (20301991) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150845 + 10150846.

It is an arithmetic number, because the mean of its divisors is an integer number (10150846).

Almost surely, 2^20301691 is an apocalyptic number.

20301691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20301691 is an equidigital number, since it uses as much as digits as its factorization.

20301691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20301691 is about 4505.7397838757. The cubic root of 20301691 is about 272.7998147804.

Adding to 20301691 its reverse (19610302), we get a palindrome (39911993).

It can be divided in two parts, 2030 and 1691, that added together give a square (3721 = 61²).

The spelling of 20301691 in words is "twenty million, three hundred one thousand, six hundred ninety-one".