19805902094 has 16 divisors (see below), whose sum is σ = 33818774400. Its totient is φ = 8611261560.

The previous prime is 19805902079. The next prime is 19805902097. The reversal of 19805902094 is 49020950891.

It is a super-2 number, since 2×19805902094² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19805902097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19570544 + ... + 19571555.

It is an arithmetic number, because the mean of its divisors is an integer number (2113673400).

Almost surely, 2^19805902094 is an apocalyptic number.

19805902094 is a deficient number, since it is larger than the sum of its proper divisors (14012872306).

19805902094 is a wasteful number, since it uses less digits than its factorization.

19805902094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39142135.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 19805902094 in words is "nineteen billion, eight hundred five million, nine hundred two thousand, ninety-four".