20531242253 has 2 divisors, whose sum is σ = 20531242254. Its totient is φ = 20531242252.

The previous prime is 20531242219. The next prime is 20531242267. The reversal of 20531242253 is 35224213502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17357272009 + 3173970244 = 131747^2 + 56338^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531242253 - 2¹⁰ = 20531241229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531242153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265621126 + 10265621127.

It is an arithmetic number, because the mean of its divisors is an integer number (10265621127).

Almost surely, 2^20531242253 is an apocalyptic number.

It is an amenable number.

20531242253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531242253 is an equidigital number, since it uses as much as digits as its factorization.

20531242253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20531242253 its reverse (35224213502), we get a palindrome (55755455755).

The spelling of 20531242253 in words is "twenty billion, five hundred thirty-one million, two hundred forty-two thousand, two hundred fifty-three".