19495920 has 40 divisors (see below), whose sum is σ = 60438096. Its totient is φ = 5198848.

The previous prime is 19495909. The next prime is 19495921. The reversal of 19495920 is 2959491.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19495921) 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, 40377 + ... + 40856.

Almost surely, 2^19495920 is an apocalyptic number.

19495920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19495920 is an abundant number, since it is smaller than the sum of its proper divisors (40942176).

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

19495920 is a wasteful number, since it uses less digits than its factorization.

19495920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81249 (or 81243 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 19495920 is about 4415.4184399669. The cubic root of 19495920 is about 269.1418570664.

The spelling of 19495920 in words is "nineteen million, four hundred ninety-five thousand, nine hundred twenty".