19943946992 has 20 divisors (see below), whose sum is σ = 38646038400. Its totient is φ = 9970775808.

The previous prime is 19943946991. The next prime is 19943947021. The reversal of 19943946992 is 29964934991.

It is a happy number.

It is a super-2 number, since 2×19943946992² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19943946991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71153 + ... + 212015.

It is an arithmetic number, because the mean of its divisors is an integer number (1932301920).

Almost surely, 2^19943946992 is an apocalyptic number.

It is an amenable number.

19943946992 is a deficient number, since it is larger than the sum of its proper divisors (18702091408).

19943946992 is a wasteful number, since it uses less digits than its factorization.

19943946992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149720 (or 149714 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 65.

The spelling of 19943946992 in words is "nineteen billion, nine hundred forty-three million, nine hundred forty-six thousand, nine hundred ninety-two".