20935774864 has 45 divisors (see below), whose sum is σ = 41308593339. Its totient is φ = 10278919680.

The previous prime is 20935774843. The next prime is 20935774877. The reversal of 20935774864 is 46847753902.

The square root of 20935774864 is 144692.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4604979600 + 16330795264 = 67860^2 + 127792^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35304552 + ... + 35305144.

Almost surely, 2^20935774864 is an apocalyptic number.

20935774864 is the 144692-nd square number.

It is an amenable number.

20935774864 is a deficient number, since it is larger than the sum of its proper divisors (20372818475).

20935774864 is an frugal number, since it uses more digits than its factorization.

20935774864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 20935774864 in words is "twenty billion, nine hundred thirty-five million, seven hundred seventy-four thousand, eight hundred sixty-four".