20655532361 has 4 divisors (see below), whose sum is σ = 20946455424. Its totient is φ = 20364609300.

The previous prime is 20655532357. The next prime is 20655532367. The reversal of 20655532361 is 16323555602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16323555602 = 2 ⋅8161777801.

It is a cyclic number.

It is not a de Polignac number, because 20655532361 - 2² = 20655532357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20655532367) 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, 145461425 + ... + 145461566.

It is an arithmetic number, because the mean of its divisors is an integer number (5236613856).

Almost surely, 2^20655532361 is an apocalyptic number.

It is an amenable number.

20655532361 is a deficient number, since it is larger than the sum of its proper divisors (290923063).

20655532361 is an equidigital number, since it uses as much as digits as its factorization.

20655532361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290923062.

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 20655532361 in words is "twenty billion, six hundred fifty-five million, five hundred thirty-two thousand, three hundred sixty-one".