20603731601 has 2 divisors, whose sum is σ = 20603731602. Its totient is φ = 20603731600.

The previous prime is 20603731571. The next prime is 20603731619. The reversal of 20603731601 is 10613730602.

It is a Cunningham number, because it is equal to 143540²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20603731600 + 1 = 143540^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 20603731601 - 2¹⁴ = 20603715217 is a prime.

It is not a weakly prime, because it can be changed into another prime (20603731691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10301865800 + 10301865801.

It is an arithmetic number, because the mean of its divisors is an integer number (10301865801).

Almost surely, 2^20603731601 is an apocalyptic number.

It is an amenable number.

20603731601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20603731601 is an equidigital number, since it uses as much as digits as its factorization.

20603731601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

Subtracting from 20603731601 its reverse (10613730602), we obtain a palindrome (9990000999).

The spelling of 20603731601 in words is "twenty billion, six hundred three million, seven hundred thirty-one thousand, six hundred one".