20555220203 has 16 divisors (see below), whose sum is σ = 23885733120. Its totient is φ = 17323437600.

The previous prime is 20555220137. The next prime is 20555220227. The reversal of 20555220203 is 30202255502.

It is a happy number.

It is not a de Polignac number, because 20555220203 - 2⁸ = 20555219947 is a prime.

It is a super-2 number, since 2×20555220203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555220233) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1384208 + ... + 1398978.

It is an arithmetic number, because the mean of its divisors is an integer number (1492858320).

Almost surely, 2^20555220203 is an apocalyptic number.

20555220203 is a deficient number, since it is larger than the sum of its proper divisors (3330512917).

20555220203 is a wasteful number, since it uses less digits than its factorization.

20555220203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18098.

The product of its (nonzero) digits is 6000, while the sum is 26.

Adding to 20555220203 its reverse (30202255502), we get a palindrome (50757475705).

The spelling of 20555220203 in words is "twenty billion, five hundred fifty-five million, two hundred twenty thousand, two hundred three".