20719984 has 10 divisors (see below), whose sum is σ = 40145000. Its totient is φ = 10359984.

The previous prime is 20719981. The next prime is 20720027. The reversal of 20719984 is 48991702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20719981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647484 + ... + 647515.

It is an arithmetic number, because the mean of its divisors is an integer number (4014500).

Almost surely, 2^20719984 is an apocalyptic number.

It is an amenable number.

20719984 is a deficient number, since it is larger than the sum of its proper divisors (19425016).

20719984 is a wasteful number, since it uses less digits than its factorization.

20719984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295007 (or 1295001 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20719984 is about 4551.9209131970. The cubic root of 20719984 is about 274.6606679600.

The spelling of 20719984 in words is "twenty million, seven hundred nineteen thousand, nine hundred eighty-four".