19802490050 has 54 divisors (see below), whose sum is σ = 42861198393. Its totient is φ = 6787037040.

The previous prime is 19802490041. The next prime is 19802490077. The reversal of 19802490050 is 5009420891.

It can be written as a sum of positive squares in 2 ways, for example, as 19406440249 + 396049801 = 139307^2 + 19901^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99505.

It is a super-2 number, since 2×19802490050² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19802489986 and 19802490013.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6963929 + ... + 6966771.

Almost surely, 2^19802490050 is an apocalyptic number.

19802490050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19802490050 is an abundant number, since it is smaller than the sum of its proper divisors (23058708343).

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

19802490050 is an frugal number, since it uses more digits than its factorization.

19802490050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5712 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 19802490050 in words is "nineteen billion, eight hundred two million, four hundred ninety thousand, fifty".