20730606553 has 2 divisors, whose sum is σ = 20730606554. Its totient is φ = 20730606552.

The previous prime is 20730606511. The next prime is 20730606563. The reversal of 20730606553 is 35560603702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19600840009 + 1129766544 = 140003^2 + 33612^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730606553 - 2²⁹ = 20193735641 is a prime.

It is not a weakly prime, because it can be changed into another prime (20730606563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365303276 + 10365303277.

It is an arithmetic number, because the mean of its divisors is an integer number (10365303277).

Almost surely, 2^20730606553 is an apocalyptic number.

It is an amenable number.

20730606553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730606553 is an equidigital number, since it uses as much as digits as its factorization.

20730606553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 37.

The spelling of 20730606553 in words is "twenty billion, seven hundred thirty million, six hundred six thousand, five hundred fifty-three".