20648719 has 16 divisors (see below), whose sum is σ = 25672192. Its totient is φ = 16171488.

The previous prime is 20648711. The next prime is 20648737. The reversal of 20648719 is 91784602.

It is a cyclic number.

It is not a de Polignac number, because 20648719 - 2³ = 20648711 is a prime.

It is a super-2 number, since 2×20648719² = 852739192681922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648711) by changing a digit.

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, 8272 + ... + 10474.

It is an arithmetic number, because the mean of its divisors is an integer number (1604512).

Almost surely, 2^20648719 is an apocalyptic number.

20648719 is a deficient number, since it is larger than the sum of its proper divisors (5023473).

20648719 is a wasteful number, since it uses less digits than its factorization.

20648719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20648719 is about 4544.0861567536. The cubic root of 20648719 is about 274.3454139154.

The spelling of 20648719 in words is "twenty million, six hundred forty-eight thousand, seven hundred nineteen".