19671842340 has 72 divisors (see below), whose sum is σ = 59685208128. Its totient is φ = 5244598080.

The previous prime is 19671842327. The next prime is 19671842347. The reversal of 19671842340 is 4324817691.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (19671842347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 967519 + ... + 987641.

It is an arithmetic number, because the mean of its divisors is an integer number (828961224).

Almost surely, 2^19671842340 is an apocalyptic number.

19671842340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19671842340 is an abundant number, since it is smaller than the sum of its proper divisors (40013365788).

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

19671842340 is a wasteful number, since it uses less digits than its factorization.

19671842340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25569 (or 25564 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 19671842340 in words is "nineteen billion, six hundred seventy-one million, eight hundred forty-two thousand, three hundred forty".