20603665355 has 32 divisors (see below), whose sum is σ = 32220042624. Its totient is φ = 12274292736.

The previous prime is 20603665339. The next prime is 20603665363. The reversal of 20603665355 is 55356630602.

It is a cyclic number.

It is not a de Polignac number, because 20603665355 - 2⁴ = 20603665339 is a prime.

It is a super-2 number, since 2×20603665355² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 1324112 + ... + 1339581.

It is an arithmetic number, because the mean of its divisors is an integer number (1006876332).

Almost surely, 2^20603665355 is an apocalyptic number.

20603665355 is a deficient number, since it is larger than the sum of its proper divisors (11616377269).

20603665355 is a wasteful number, since it uses less digits than its factorization.

20603665355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663735.

The product of its (nonzero) digits is 486000, while the sum is 41.

The spelling of 20603665355 in words is "twenty billion, six hundred three million, six hundred sixty-five thousand, three hundred fifty-five".