20236556453 has 2 divisors, whose sum is σ = 20236556454. Its totient is φ = 20236556452.

The previous prime is 20236556383. The next prime is 20236556477. The reversal of 20236556453 is 35465563202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15271522084 + 4965034369 = 123578^2 + 70463^2 .

It is a cyclic number.

It is not a de Polignac number, because 20236556453 - 2¹⁴ = 20236540069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20236556453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20236558453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10118278226 + 10118278227.

It is an arithmetic number, because the mean of its divisors is an integer number (10118278227).

Almost surely, 2^20236556453 is an apocalyptic number.

It is an amenable number.

20236556453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20236556453 is an equidigital number, since it uses as much as digits as its factorization.

20236556453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 41.

The spelling of 20236556453 in words is "twenty billion, two hundred thirty-six million, five hundred fifty-six thousand, four hundred fifty-three".