20066761821 has 8 divisors (see below), whose sum is σ = 28163876320. Its totient is φ = 12673744272.

The previous prime is 20066761789. The next prime is 20066761829. The reversal of 20066761821 is 12816766002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20066761821 - 2⁵ = 20066761789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20066761821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066761829) 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 7 ways as a sum of consecutive naturals, for example, 176024170 + ... + 176024283.

It is an arithmetic number, because the mean of its divisors is an integer number (3520484540).

Almost surely, 2^20066761821 is an apocalyptic number.

It is an amenable number.

20066761821 is a deficient number, since it is larger than the sum of its proper divisors (8097114499).

20066761821 is a wasteful number, since it uses less digits than its factorization.

20066761821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352048475.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 20066761821 in words is "twenty billion, sixty-six million, seven hundred sixty-one thousand, eight hundred twenty-one".