20551055553 has 36 divisors (see below), whose sum is σ = 34620424020. Its totient is φ = 11713173696.

The previous prime is 20551055513. The next prime is 20551055573. The reversal of 20551055553 is 35555015502.

20551055553 is a `hidden beast` number, since 2 + 0 + 5 + 51 + 0 + 55 + 553 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14794343424 + 5756712129 = 121632^2 + 75873^2 .

It is not a de Polignac number, because 20551055553 - 2¹⁸ = 20550793409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20551055513) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111651 + ... + 231447.

It is an arithmetic number, because the mean of its divisors is an integer number (961678445).

Almost surely, 2^20551055553 is an apocalyptic number.

It is an amenable number.

20551055553 is a deficient number, since it is larger than the sum of its proper divisors (14069368467).

20551055553 is a wasteful number, since it uses less digits than its factorization.

20551055553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120206 (or 120196 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 36.

The spelling of 20551055553 in words is "twenty billion, five hundred fifty-one million, fifty-five thousand, five hundred fifty-three".