19613920 has 48 divisors (see below), whose sum is σ = 49070448. Its totient is φ = 7383040.

The previous prime is 19613887. The next prime is 19613921. The reversal of 19613920 is 2931691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19613921) 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, 886 + ... + 6325.

It is an arithmetic number, because the mean of its divisors is an integer number (1022301).

Almost surely, 2^19613920 is an apocalyptic number.

19613920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19613920 is an abundant number, since it is smaller than the sum of its proper divisors (29456528).

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

19613920 is a wasteful number, since it uses less digits than its factorization.

19613920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7243 (or 7235 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 19613920 is about 4428.7605489572. The cubic root of 19613920 is about 269.6837632695.

The spelling of 19613920 in words is "nineteen million, six hundred thirteen thousand, nine hundred twenty".