20020435511553 has 20 divisors (see below), whose sum is σ = 31481126667760. Its totient is φ = 12644485585272.

The previous prime is 20020435511543. The next prime is 20020435511569. The reversal of 20020435511553 is 35511553402002.

20020435511553 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 0 + 43 + 55 + 11 + 553 = 666.

It is not a de Polignac number, because 20020435511553 - 2⁴ = 20020435511537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020435511543) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6504363475 + ... + 6504366552.

It is an arithmetic number, because the mean of its divisors is an integer number (1574056333388).

Almost surely, 2^{20020435511553} is an apocalyptic number.

It is an amenable number.

20020435511553 is a deficient number, since it is larger than the sum of its proper divisors (11460691156207).

20020435511553 is a wasteful number, since it uses less digits than its factorization.

20020435511553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13008730058 (or 13008730049 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 20020435511553 its reverse (35511553402002), we get a palindrome (55531988913555).

The spelling of 20020435511553 in words is "twenty trillion, twenty billion, four hundred thirty-five million, five hundred eleven thousand, five hundred fifty-three".