20534454553 has 2 divisors, whose sum is σ = 20534454554. Its totient is φ = 20534454552.

The previous prime is 20534454541. The next prime is 20534454607. The reversal of 20534454553 is 35545443502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18271739929 + 2262714624 = 135173^2 + 47568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20534454553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20534454053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267227276 + 10267227277.

It is an arithmetic number, because the mean of its divisors is an integer number (10267227277).

Almost surely, 2^20534454553 is an apocalyptic number.

It is an amenable number.

20534454553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20534454553 is an equidigital number, since it uses as much as digits as its factorization.

20534454553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720000, while the sum is 40.

The spelling of 20534454553 in words is "twenty billion, five hundred thirty-four million, four hundred fifty-four thousand, five hundred fifty-three".