19803235830 has 192 divisors, whose sum is σ = 59773282560. Its totient is φ = 4172103936.

The previous prime is 19803235799. The next prime is 19803235831. The reversal of 19803235830 is 3853230891.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19803235831) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1023829 + ... + 1042991.

It is an arithmetic number, because the mean of its divisors is an integer number (311319180).

Almost surely, 2^19803235830 is an apocalyptic number.

19803235830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19803235830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29886641280).

19803235830 is an abundant number, since it is smaller than the sum of its proper divisors (39970046730).

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

19803235830 is a wasteful number, since it uses less digits than its factorization.

19803235830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19243 (or 19236 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 19803235830 in words is "nineteen billion, eight hundred three million, two hundred thirty-five thousand, eight hundred thirty".