19896940 has 72 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 6709248.

The previous prime is 19896913. The next prime is 19896941. The reversal of 19896940 is 4969891.

It is not an unprimeable number, because it can be changed into a prime (19896941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77292 + ... + 77548.

It is an arithmetic number, because the mean of its divisors is an integer number (686280).

Almost surely, 2^19896940 is an apocalyptic number.

19896940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19896940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24706080).

19896940 is an abundant number, since it is smaller than the sum of its proper divisors (29515220).

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

19896940 is a wasteful number, since it uses less digits than its factorization.

19896940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 19896940 is about 4460.5986145359. The cubic root of 19896940 is about 270.9747120370.

The spelling of 19896940 in words is "nineteen million, eight hundred ninety-six thousand, nine hundred forty".