19999950 has 48 divisors (see below), whose sum is σ = 49984896. Its totient is φ = 5292000.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999950 is 5999991.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19999893 and 19999902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22209 + ... + 23091.

It is an arithmetic number, because the mean of its divisors is an integer number (1041352).

Almost surely, 2^19999950 is an apocalyptic number.

19999950 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 19999950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24992448).

19999950 is an abundant number, since it is smaller than the sum of its proper divisors (29984946).

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

19999950 is a wasteful number, since it uses less digits than its factorization.

19999950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 295245, while the sum is 51.

The square root of 19999950 is about 4472.1303648261. The cubic root of 19999950 is about 271.4415354578.

The spelling of 19999950 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred fifty".