19920517930 has 16 divisors (see below), whose sum is σ = 35990234280. Its totient is φ = 7938584512.

The previous prime is 19920517927. The next prime is 19920517957. The reversal of 19920517930 is 3971502991.

It can be written as a sum of positive squares in 4 ways, for example, as 16796937609 + 3123580321 = 129603^2 + 55889^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3700009 + ... + 3705388.

Almost surely, 2^19920517930 is an apocalyptic number.

19920517930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19920517930 is a deficient number, since it is larger than the sum of its proper divisors (16069716350).

19920517930 is a wasteful number, since it uses less digits than its factorization.

19920517930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7405673.

The product of its (nonzero) digits is 153090, while the sum is 46.

The spelling of 19920517930 in words is "nineteen billion, nine hundred twenty million, five hundred seventeen thousand, nine hundred thirty".