19577133820 has 96 divisors (see below), whose sum is σ = 43577210880. Its totient is φ = 7376624640.

The previous prime is 19577133817. The next prime is 19577133827. The reversal of 19577133820 is 2833177591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19577133827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4491082 + ... + 4495438.

It is an arithmetic number, because the mean of its divisors is an integer number (453929280).

Almost surely, 2^19577133820 is an apocalyptic number.

19577133820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19577133820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21788605440).

19577133820 is an abundant number, since it is smaller than the sum of its proper divisors (24000077060).

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

19577133820 is a wasteful number, since it uses less digits than its factorization.

19577133820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583 (or 4581 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 19577133820 in words is "nineteen billion, five hundred seventy-seven million, one hundred thirty-three thousand, eight hundred twenty".