20445779756 has 6 divisors (see below), whose sum is σ = 35780114580. Its totient is φ = 10222889876.

The previous prime is 20445779747. The next prime is 20445779801. The reversal of 20445779756 is 65797754402.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2555722466 + ... + 2555722473.

It is an arithmetic number, because the mean of its divisors is an integer number (5963352430).

Almost surely, 2^20445779756 is an apocalyptic number.

It is an amenable number.

20445779756 is a deficient number, since it is larger than the sum of its proper divisors (15334334824).

20445779756 is a wasteful number, since it uses less digits than its factorization.

20445779756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111444943 (or 5111444941 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 20445779756 in words is "twenty billion, four hundred forty-five million, seven hundred seventy-nine thousand, seven hundred fifty-six".