19929715690 has 32 divisors (see below), whose sum is σ = 36006768000. Its totient is φ = 7942327104.

The previous prime is 19929715679. The next prime is 19929715697. The reversal of 19929715690 is 9651792991.

It is a happy number.

It is a super-2 number, since 2×19929715690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19929715697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3225444 + ... + 3231616.

It is an arithmetic number, because the mean of its divisors is an integer number (1125211500).

Almost surely, 2^19929715690 is an apocalyptic number.

19929715690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19929715690 is a deficient number, since it is larger than the sum of its proper divisors (16077052310).

19929715690 is a wasteful number, since it uses less digits than its factorization.

19929715690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7326.

The product of its (nonzero) digits is 2755620, while the sum is 58.

The spelling of 19929715690 in words is "nineteen billion, nine hundred twenty-nine million, seven hundred fifteen thousand, six hundred ninety".