19953257536 has 21 divisors (see below), whose sum is σ = 39596987989. Its totient is φ = 9976063744.

The previous prime is 19953257507. The next prime is 19953257543. The reversal of 19953257536 is 63575235991.

The square root of 19953257536 is 141256.

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

It can be written as a sum of positive squares in only one way, i.e., 2385345600 + 17567911936 = 48840^2 + 132544^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1121220 + ... + 1138876.

Almost surely, 2^19953257536 is an apocalyptic number.

19953257536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19953257536 is the 141256-th square number.

It is an amenable number.

19953257536 is a deficient number, since it is larger than the sum of its proper divisors (19643730453).

19953257536 is an frugal number, since it uses more digits than its factorization.

19953257536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35326 (or 17659 counting only the distinct ones).

The product of its digits is 7654500, while the sum is 55.

The spelling of 19953257536 in words is "nineteen billion, nine hundred fifty-three million, two hundred fifty-seven thousand, five hundred thirty-six".