19805903942 has 16 divisors (see below), whose sum is σ = 32712558912. Its totient is φ = 8918545320.

The previous prime is 19805903939. The next prime is 19805903987. The reversal of 19805903942 is 24930950891.

It is a happy number.

It is a super-2 number, since 2×19805903942² (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 7 ways as a sum of consecutive naturals, for example, 4204508 + ... + 4209215.

It is an arithmetic number, because the mean of its divisors is an integer number (2044534932).

Almost surely, 2^19805903942 is an apocalyptic number.

19805903942 is a deficient number, since it is larger than the sum of its proper divisors (12906654970).

19805903942 is a wasteful number, since it uses less digits than its factorization.

19805903942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8413843.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 19805903942 in words is "nineteen billion, eight hundred five million, nine hundred three thousand, nine hundred forty-two".