19539971040 has 48 divisors (see below), whose sum is σ = 61550910288. Its totient is φ = 5210658816.

The previous prime is 19539971029. The next prime is 19539971041. The reversal of 19539971040 is 4017993591.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19539971041) 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, 20353657 + ... + 20354616.

It is an arithmetic number, because the mean of its divisors is an integer number (1282310631).

Almost surely, 2^19539971040 is an apocalyptic number.

19539971040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19539971040 is an abundant number, since it is smaller than the sum of its proper divisors (42010939248).

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

19539971040 is a wasteful number, since it uses less digits than its factorization.

19539971040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40708291 (or 40708283 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The spelling of 19539971040 in words is "nineteen billion, five hundred thirty-nine million, nine hundred seventy-one thousand, forty".