20719340 has 48 divisors (see below), whose sum is σ = 45511200. Its totient is φ = 7913472.

The previous prime is 20719337. The next prime is 20719357. The reversal of 20719340 is 4391702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80492 + ... + 80748.

It is an arithmetic number, because the mean of its divisors is an integer number (948150).

Almost surely, 2^20719340 is an apocalyptic number.

20719340 is a gapful number since it is divisible by the number (20) 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 20719340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22755600).

20719340 is an abundant number, since it is smaller than the sum of its proper divisors (24791860).

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

20719340 is a wasteful number, since it uses less digits than its factorization.

20719340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20719340 is about 4551.8501732812. The cubic root of 20719340 is about 274.6578223448.

It can be divided in two parts, 2071 and 9340, that added together give a palindrome (11411).

The spelling of 20719340 in words is "twenty million, seven hundred nineteen thousand, three hundred forty".