19905259396 has 63 divisors (see below), whose sum is σ = 39054237397. Its totient is φ = 8877131120.

The previous prime is 19905259393. The next prime is 19905259417. The reversal of 19905259396 is 69395250991.

The square root of 19905259396 is 141086.

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., 14349644100 + 5555615296 = 119790^2 + 74536^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19905259396.

It is not an unprimeable number, because it can be changed into a prime (19905259393) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 375570906 + ... + 375570958.

Almost surely, 2^19905259396 is an apocalyptic number.

19905259396 is the 141086-th square number.

It is an amenable number.

19905259396 is a deficient number, since it is larger than the sum of its proper divisors (19148978001).

19905259396 is an frugal number, since it uses more digits than its factorization.

19905259396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 5904900, while the sum is 58.

The spelling of 19905259396 in words is "nineteen billion, nine hundred five million, two hundred fifty-nine thousand, three hundred ninety-six".