19781050540 has 24 divisors (see below), whose sum is σ = 41544599040. Its totient is φ = 7911583488.

The previous prime is 19781050529. The next prime is 19781050547. The reversal of 19781050540 is 4505018791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19781050493 and 19781050502.

It is not an unprimeable number, because it can be changed into a prime (19781050547) 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, 163221 + ... + 257299.

It is an arithmetic number, because the mean of its divisors is an integer number (1731024960).

Almost surely, 2^19781050540 is an apocalyptic number.

19781050540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19781050540 is an abundant number, since it is smaller than the sum of its proper divisors (21763548500).

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

19781050540 is a wasteful number, since it uses less digits than its factorization.

19781050540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104601 (or 104599 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 19781050540 in words is "nineteen billion, seven hundred eighty-one million, fifty thousand, five hundred forty".