19550 has 24 divisors (see below), whose sum is σ = 40176. Its totient is φ = 7040.

The previous prime is 19543. The next prime is 19553. The reversal of 19550 is 5591.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

19550 is an undulating number in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19553) by changing a digit.

19550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 839 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (1674).

2¹⁹⁵⁵⁰ is an apocalyptic number.

19550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19550 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20088).

19550 is a wasteful number, since it uses less digits than its factorization.

19550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 19550 is about 139.8213145411. The cubic root of 19550 is about 26.9390486080.

The spelling of 19550 in words is "nineteen thousand, five hundred fifty".