19963920735 has 24 divisors (see below), whose sum is σ = 37749960144. Its totient is φ = 9679476480.

The previous prime is 19963920727. The next prime is 19963920773. The reversal of 19963920735 is 53702936991.

It is a happy number.

It is not a de Polignac number, because 19963920735 - 2³ = 19963920727 is a prime.

It is a super-2 number, since 2×19963920735² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20165082 + ... + 20166071.

It is an arithmetic number, because the mean of its divisors is an integer number (1572915006).

Almost surely, 2^19963920735 is an apocalyptic number.

19963920735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19963920735 is a deficient number, since it is larger than the sum of its proper divisors (17786039409).

19963920735 is a wasteful number, since it uses less digits than its factorization.

19963920735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40331175 (or 40331172 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The spelling of 19963920735 in words is "nineteen billion, nine hundred sixty-three million, nine hundred twenty thousand, seven hundred thirty-five".