20685752671 has 4 divisors (see below), whose sum is σ = 20698193152. Its totient is φ = 20673312192.

The previous prime is 20685752641. The next prime is 20685752683. The reversal of 20685752671 is 17625758602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20685752671 - 2¹³ = 20685744479 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 (20685752641) 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, 6217746 + ... + 6221071.

It is an arithmetic number, because the mean of its divisors is an integer number (5174548288).

Almost surely, 2^20685752671 is an apocalyptic number.

20685752671 is a deficient number, since it is larger than the sum of its proper divisors (12440481).

20685752671 is a wasteful number, since it uses less digits than its factorization.

20685752671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12440480.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 20685752671 in words is "twenty billion, six hundred eighty-five million, seven hundred fifty-two thousand, six hundred seventy-one".