19806734040 has 64 divisors (see below), whose sum is σ = 59432456160. Its totient is φ = 5280706560.

The previous prime is 19806734021. The next prime is 19806734071. The reversal of 19806734040 is 4043760891.

It is a junction number, because it is equal to n+sod(n) for n = 19806733983 and 19806734001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 688750 + ... + 716930.

Almost surely, 2^19806734040 is an apocalyptic number.

19806734040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19806734040 is an abundant number, since it is smaller than the sum of its proper divisors (39625722120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19806734040 is a wasteful number, since it uses less digits than its factorization.

19806734040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34052 (or 34048 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 19806734040 in words is "nineteen billion, eight hundred six million, seven hundred thirty-four thousand, forty".