19800550 has 96 divisors (see below), whose sum is σ = 47496960. Its totient is φ = 5961600.

The previous prime is 19800497. The next prime is 19800553. The reversal of 19800550 is 5500891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142381 + ... + 142519.

It is an arithmetic number, because the mean of its divisors is an integer number (494760).

Almost surely, 2^19800550 is an apocalyptic number.

19800550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19800550 is an abundant number, since it is smaller than the sum of its proper divisors (27696410).

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

19800550 is a wasteful number, since it uses less digits than its factorization.

19800550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 19800550 is about 4449.7808934823. The cubic root of 19800550 is about 270.5364278201.

It can be divided in two parts, 19800 and 550, that multiplied together give a square (10890000 = 3300²).

The spelling of 19800550 in words is "nineteen million, eight hundred thousand, five hundred fifty".