20001234553 has 4 divisors (see below), whose sum is σ = 21177777780. Its totient is φ = 18824691328.

The previous prime is 20001234523. The next prime is 20001234593. The reversal of 20001234553 is 35543210002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35543210002 = 2 ⋅17771605001.

It can be written as a sum of positive squares in 2 ways, for example, as 17512022889 + 2489211664 = 132333^2 + 49892^2 .

It is not a de Polignac number, because 20001234553 - 2⁵ = 20001234521 is a prime.

It is a super-2 number, since 2×20001234553² (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 (20001234523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588271588 + ... + 588271621.

It is an arithmetic number, because the mean of its divisors is an integer number (5294444445).

Almost surely, 2^20001234553 is an apocalyptic number.

It is an amenable number.

20001234553 is a deficient number, since it is larger than the sum of its proper divisors (1176543227).

20001234553 is a wasteful number, since it uses less digits than its factorization.

20001234553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176543226.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20001234553 its reverse (35543210002), we get a palindrome (55544444555).

The spelling of 20001234553 in words is "twenty billion, one million, two hundred thirty-four thousand, five hundred fifty-three".