20051032553 has 4 divisors (see below), whose sum is σ = 20052824388. Its totient is φ = 20049240720.

The previous prime is 20051032513. The next prime is 20051032559. The reversal of 20051032553 is 35523015002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35523015002 = 2 ⋅17761507501.

It can be written as a sum of positive squares in 2 ways, for example, as 10026417424 + 10024615129 = 100132^2 + 100123^2 .

It is a cyclic number.

It is not a de Polignac number, because 20051032553 - 2¹² = 20051028457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051032559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879026 + ... + 901547.

It is an arithmetic number, because the mean of its divisors is an integer number (5013206097).

Almost surely, 2^20051032553 is an apocalyptic number.

It is an amenable number.

20051032553 is a deficient number, since it is larger than the sum of its proper divisors (1791835).

20051032553 is a wasteful number, since it uses less digits than its factorization.

20051032553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791834.

The product of its (nonzero) digits is 4500, while the sum is 26.

Adding to 20051032553 its reverse (35523015002), we get a palindrome (55574047555).

The spelling of 20051032553 in words is "twenty billion, fifty-one million, thirty-two thousand, five hundred fifty-three".