20520051115153 has 2 divisors, whose sum is σ = 20520051115154. Its totient is φ = 20520051115152.

The previous prime is 20520051115141. The next prime is 20520051115163. The reversal of 20520051115153 is 35151115002502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19746087533649 + 773963581504 = 4443657^2 + 879752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20520051115153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20520051115133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260025557576 + 10260025557577.

It is an arithmetic number, because the mean of its divisors is an integer number (10260025557577).

Almost surely, 2^{20520051115153} is an apocalyptic number.

It is an amenable number.

20520051115153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520051115153 is an equidigital number, since it uses as much as digits as its factorization.

20520051115153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 20520051115153 its reverse (35151115002502), we get a palindrome (55671166117655).

The spelling of 20520051115153 in words is "twenty trillion, five hundred twenty billion, fifty-one million, one hundred fifteen thousand, one hundred fifty-three".