19963994436 has 27 divisors (see below), whose sum is σ = 50466684541. Its totient is φ = 6654382224.

The previous prime is 19963994423. The next prime is 19963994447. The reversal of 19963994436 is 63449936991.

The square root of 19963994436 is 141294.

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

19963994436 is a `hidden beast` number, since 19 + 96 + 3 + 99 + 443 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 19948737600 = 3906^2 + 141240^2 .

It is a super-2 number, since 2×19963994436² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 835990 + ... + 859538.

Almost surely, 2^19963994436 is an apocalyptic number.

19963994436 is the 141294-th square number.

It is an amenable number.

19963994436 is an abundant number, since it is smaller than the sum of its proper divisors (30502690105).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19963994436 is an frugal number, since it uses more digits than its factorization.

19963994436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47108 (or 23554 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 63.

The spelling of 19963994436 in words is "nineteen billion, nine hundred sixty-three million, nine hundred ninety-four thousand, four hundred thirty-six".