20445640766 has 8 divisors (see below), whose sum is σ = 30677312280. Its totient is φ = 10219870008.

The previous prime is 20445640763. The next prime is 20445640781. The reversal of 20445640766 is 66704654402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445640763) 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, 1466516 + ... + 1480391.

It is an arithmetic number, because the mean of its divisors is an integer number (3834664035).

Almost surely, 2^20445640766 is an apocalyptic number.

20445640766 is a deficient number, since it is larger than the sum of its proper divisors (10231671514).

20445640766 is a wasteful number, since it uses less digits than its factorization.

20445640766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950378.

The product of its (nonzero) digits is 967680, while the sum is 44.

The spelling of 20445640766 in words is "twenty billion, four hundred forty-five million, six hundred forty thousand, seven hundred sixty-six".