19994500 has 24 divisors (see below), whose sum is σ = 43669080. Its totient is φ = 7997600.

The previous prime is 19994489. The next prime is 19994503. The reversal of 19994500 is 549991.

It can be written as a sum of positive squares in 4 ways, for example, as 3069504 + 16924996 = 1752^2 + 4114^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19994500.

It is not an unprimeable number, because it can be changed into a prime (19994503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19495 + ... + 20494.

It is an arithmetic number, because the mean of its divisors is an integer number (1819545).

Almost surely, 2^19994500 is an apocalyptic number.

19994500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19994500 is an abundant number, since it is smaller than the sum of its proper divisors (23674580).

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

19994500 is a wasteful number, since it uses less digits than its factorization.

19994500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40008 (or 39996 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 19994500 is about 4471.5209940243. The cubic root of 19994500 is about 271.4168772168.

The spelling of 19994500 in words is "nineteen million, nine hundred ninety-four thousand, five hundred".