20128553 has 2 divisors, whose sum is σ = 20128554. Its totient is φ = 20128552.

The previous prime is 20128531. The next prime is 20128573. The reversal of 20128553 is 35582102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 2930944 = 4147^2 + 1712^2 .

It is a cyclic number.

It is not a de Polignac number, because 20128553 - 2¹² = 20124457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20128513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064276 + 10064277.

It is an arithmetic number, because the mean of its divisors is an integer number (10064277).

Almost surely, 2^20128553 is an apocalyptic number.

It is an amenable number.

20128553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128553 is an equidigital number, since it uses as much as digits as its factorization.

20128553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20128553 is about 4486.4855956528. The cubic root of 20128553 is about 272.0220975776.

The spelling of 20128553 in words is "twenty million, one hundred twenty-eight thousand, five hundred fifty-three".