18920256692 has 12 divisors (see below), whose sum is σ = 35058122820. Its totient is φ = 8903650176.

The previous prime is 18920256689. The next prime is 18920256701. The reversal of 18920256692 is 29665202981.

It can be written as a sum of positive squares in 2 ways, for example, as 7935959056 + 10984297636 = 89084^2 + 104806^2 .

It is a super-2 number, since 2×18920256692² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18920256692.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139119467 + ... + 139119602.

It is an arithmetic number, because the mean of its divisors is an integer number (2921510235).

Almost surely, 2^18920256692 is an apocalyptic number.

It is an amenable number.

18920256692 is a deficient number, since it is larger than the sum of its proper divisors (16137866128).

18920256692 is a wasteful number, since it uses less digits than its factorization.

18920256692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278239090 (or 278239088 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 18920256692 in words is "eighteen billion, nine hundred twenty million, two hundred fifty-six thousand, six hundred ninety-two".