20507274553 has 2 divisors, whose sum is σ = 20507274554. Its totient is φ = 20507274552.

The previous prime is 20507274461. The next prime is 20507274643. The reversal of 20507274553 is 35547270502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16401412624 + 4105861929 = 128068^2 + 64077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20507274553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20507272553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253637276 + 10253637277.

It is an arithmetic number, because the mean of its divisors is an integer number (10253637277).

Almost surely, 2^20507274553 is an apocalyptic number.

It is an amenable number.

20507274553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507274553 is an equidigital number, since it uses as much as digits as its factorization.

20507274553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 40.

The spelling of 20507274553 in words is "twenty billion, five hundred seven million, two hundred seventy-four thousand, five hundred fifty-three".