19845900 has 54 divisors (see below), whose sum is σ = 62208692. Its totient is φ = 5292000.

The previous prime is 19845887. The next prime is 19845901. The reversal of 19845900 is 954891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19845901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10126 + ... + 11925.

Almost surely, 2^19845900 is an apocalyptic number.

19845900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19845900 is an abundant number, since it is smaller than the sum of its proper divisors (42362792).

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

19845900 is a wasteful number, since it uses less digits than its factorization.

19845900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22071 (or 22061 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 19845900 is about 4454.8737355844. The cubic root of 19845900 is about 270.7428105098.

The spelling of 19845900 in words is "nineteen million, eight hundred forty-five thousand, nine hundred".