18920772586 has 12 divisors (see below), whose sum is σ = 29393569062. Its totient is φ = 9134165264.

The previous prime is 18920772583. The next prime is 18920772587. The reversal of 18920772586 is 68527702981.

It can be written as a sum of positive squares in 3 ways, for example, as 12716847361 + 6203925225 = 112769^2 + 78765^2 .

It is a super-2 number, since 2×18920772586² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18920772583) 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 5 ways as a sum of consecutive naturals, for example, 5622805 + ... + 5626168.

Almost surely, 2^18920772586 is an apocalyptic number.

18920772586 is a deficient number, since it is larger than the sum of its proper divisors (10472796476).

18920772586 is a wasteful number, since it uses less digits than its factorization.

18920772586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11249033 (or 11249004 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 18920772586 in words is "eighteen billion, nine hundred twenty million, seven hundred seventy-two thousand, five hundred eighty-six".