20355530553 has 8 divisors (see below), whose sum is σ = 30156341600. Its totient is φ = 13570353684.

The previous prime is 20355530537. The next prime is 20355530561. The reversal of 20355530553 is 35503555302.

20355530553 is a `hidden beast` number, since 2 + 0 + 3 + 55 + 53 + 0 + 553 = 666.

It is not a de Polignac number, because 20355530553 - 2⁴ = 20355530537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20355530593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376954243 + ... + 376954296.

It is an arithmetic number, because the mean of its divisors is an integer number (3769542700).

Almost surely, 2^20355530553 is an apocalyptic number.

It is an amenable number.

20355530553 is a deficient number, since it is larger than the sum of its proper divisors (9800811047).

20355530553 is an equidigital number, since it uses as much as digits as its factorization.

20355530553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753908548 (or 753908542 counting only the distinct ones).

The product of its (nonzero) digits is 168750, while the sum is 36.

The spelling of 20355530553 in words is "twenty billion, three hundred fifty-five million, five hundred thirty thousand, five hundred fifty-three".