199005240020 has 54 divisors (see below), whose sum is σ = 436971803982. Its totient is φ = 76123579136.

The previous prime is 199005239989. The next prime is 199005240029. The reversal of 199005240020 is 20042500991.

It can be written as a sum of positive squares in 3 ways, for example, as 24202647184 + 174802592836 = 155572^2 + 418094^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199005240029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45883292 + ... + 45887628.

Almost surely, 2^199005240020 is an apocalyptic number.

199005240020 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 199005240020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218485901991).

199005240020 is an abundant number, since it is smaller than the sum of its proper divisors (237966563962).

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

199005240020 is an frugal number, since it uses more digits than its factorization.

199005240020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8729 (or 4367 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 199005240020 in words is "one hundred ninety-nine billion, five million, two hundred forty thousand, twenty".