19920517929 has 48 divisors (see below), whose sum is σ = 31702454784. Its totient is φ = 11976854400.

The previous prime is 19920517927. The next prime is 19920517957. The reversal of 19920517929 is 92971502991.

19920517929 is a `hidden beast` number, since 19 + 9 + 20 + 517 + 92 + 9 = 666.

It is not a de Polignac number, because 19920517929 - 2¹ = 19920517927 is a prime.

It is a super-2 number, since 2×19920517929² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19920517927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3466999 + ... + 3472739.

It is an arithmetic number, because the mean of its divisors is an integer number (660467808).

Almost surely, 2^19920517929 is an apocalyptic number.

It is an amenable number.

19920517929 is a deficient number, since it is larger than the sum of its proper divisors (11781936855).

19920517929 is a wasteful number, since it uses less digits than its factorization.

19920517929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6438 (or 6435 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 54.

The spelling of 19920517929 in words is "nineteen billion, nine hundred twenty million, five hundred seventeen thousand, nine hundred twenty-nine".