20538670553 has 2 divisors, whose sum is σ = 20538670554. Its totient is φ = 20538670552.

The previous prime is 20538670489. The next prime is 20538670573. The reversal of 20538670553 is 35507683502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11144602624 + 9394067929 = 105568^2 + 96923^2 .

It is a cyclic number.

It is not a de Polignac number, because 20538670553 - 2⁶ = 20538670489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20538670573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269335276 + 10269335277.

It is an arithmetic number, because the mean of its divisors is an integer number (10269335277).

Almost surely, 2^20538670553 is an apocalyptic number.

It is an amenable number.

20538670553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538670553 is an equidigital number, since it uses as much as digits as its factorization.

20538670553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 20538670553 in words is "twenty billion, five hundred thirty-eight million, six hundred seventy thousand, five hundred fifty-three".