20571346766 has 4 divisors (see below), whose sum is σ = 30857020152. Its totient is φ = 10285673382.

The previous prime is 20571346751. The next prime is 20571346769. The reversal of 20571346766 is 66764317502.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20571346766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20571346769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5142836690 + ... + 5142836693.

It is an arithmetic number, because the mean of its divisors is an integer number (7714255038).

Almost surely, 2^20571346766 is an apocalyptic number.

20571346766 is a deficient number, since it is larger than the sum of its proper divisors (10285673386).

20571346766 is a wasteful number, since it uses less digits than its factorization.

20571346766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10285673385.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 20571346766 in words is "twenty billion, five hundred seventy-one million, three hundred forty-six thousand, seven hundred sixty-six".