19992263236 has 27 divisors (see below), whose sum is σ = 38462176767. Its totient is φ = 9085978440.

The previous prime is 19992263173. The next prime is 19992263237. The reversal of 19992263236 is 63236229991.

The square root of 19992263236 is 141394.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19992263237) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3107455 + ... + 3113881.

Almost surely, 2^19992263236 is an apocalyptic number.

19992263236 is the 141394-th square number.

It is an amenable number.

19992263236 is a deficient number, since it is larger than the sum of its proper divisors (18469913531).

19992263236 is an frugal number, since it uses more digits than its factorization.

19992263236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880 (or 6440 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 52.

The spelling of 19992263236 in words is "nineteen billion, nine hundred ninety-two million, two hundred sixty-three thousand, two hundred thirty-six".