19920989088819 has 240 divisors, whose sum is σ = 38208936826368. Its totient is φ = 10247511802752.

The previous prime is 19920989088779. The next prime is 19920989088829. The reversal of 19920989088819 is 91888098902991.

It is not a de Polignac number, because 19920989088819 - 2⁹ = 19920989088307 is a prime.

It is a super-2 number, since 2×19920989088819² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (19920989088829) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 686277184 + ... + 686306210.

Almost surely, 2^{19920989088819} is an apocalyptic number.

19920989088819 is a deficient number, since it is larger than the sum of its proper divisors (18287947737549).

19920989088819 is a wasteful number, since it uses less digits than its factorization.

19920989088819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29396 (or 29380 counting only the distinct ones).

The product of its (nonzero) digits is 483729408, while the sum is 81.

The spelling of 19920989088819 in words is "nineteen trillion, nine hundred twenty billion, nine hundred eighty-nine million, eighty-eight thousand, eight hundred nineteen".