20732087109 has 4 divisors (see below), whose sum is σ = 27642782816. Its totient is φ = 13821391404.

The previous prime is 20732087099. The next prime is 20732087147. The reversal of 20732087109 is 90178023702.

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 not a de Polignac number, because 20732087109 - 2¹¹ = 20732085061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732087309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455347849 + ... + 3455347854.

It is an arithmetic number, because the mean of its divisors is an integer number (6910695704).

Almost surely, 2^20732087109 is an apocalyptic number.

It is an amenable number.

20732087109 is a deficient number, since it is larger than the sum of its proper divisors (6910695707).

20732087109 is an equidigital number, since it uses as much as digits as its factorization.

20732087109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910695706.

The product of its (nonzero) digits is 42336, while the sum is 39.

The spelling of 20732087109 in words is "twenty billion, seven hundred thirty-two million, eighty-seven thousand, one hundred nine".