20018732361 has 4 divisors (see below), whose sum is σ = 26691643152. Its totient is φ = 13345821572.

The previous prime is 20018732351. The next prime is 20018732369. The reversal of 20018732361 is 16323781002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20018732361 - 2⁷ = 20018732233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20018732369) 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, 3336455391 + ... + 3336455396.

It is an arithmetic number, because the mean of its divisors is an integer number (6672910788).

Almost surely, 2^20018732361 is an apocalyptic number.

It is an amenable number.

20018732361 is a deficient number, since it is larger than the sum of its proper divisors (6672910791).

20018732361 is an equidigital number, since it uses as much as digits as its factorization.

20018732361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672910790.

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 20018732361 in words is "twenty billion, eighteen million, seven hundred thirty-two thousand, three hundred sixty-one".