20503355005 has 16 divisors (see below), whose sum is σ = 28154206080. Its totient is φ = 14041783872.

The previous prime is 20503354999. The next prime is 20503355017. The reversal of 20503355005 is 50055330502.

It is a cyclic number.

It is not a de Polignac number, because 20503355005 - 2⁷ = 20503354877 is a prime.

It is a super-2 number, since 2×20503355005² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339615 + ... + 395404.

It is an arithmetic number, because the mean of its divisors is an integer number (1759637880).

Almost surely, 2^20503355005 is an apocalyptic number.

It is an amenable number.

20503355005 is a deficient number, since it is larger than the sum of its proper divisors (7650851075).

20503355005 is an equidigital number, since it uses as much as digits as its factorization.

20503355005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735828.

The product of its (nonzero) digits is 11250, while the sum is 28.

Adding to 20503355005 its reverse (50055330502), we get a palindrome (70558685507).

The spelling of 20503355005 in words is "twenty billion, five hundred three million, three hundred fifty-five thousand, five".