20648223 has 16 divisors (see below), whose sum is σ = 30700800. Its totient is φ = 13715640.

The previous prime is 20648219. The next prime is 20648233. The reversal of 20648223 is 32284602.

It is not a de Polignac number, because 20648223 - 2² = 20648219 is a prime.

It is a super-2 number, since 2×20648223² = 852698226115458, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648233) 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, 7168 + ... + 9626.

It is an arithmetic number, because the mean of its divisors is an integer number (1918800).

Almost surely, 2^20648223 is an apocalyptic number.

20648223 is a deficient number, since it is larger than the sum of its proper divisors (10052577).

20648223 is a wasteful number, since it uses less digits than its factorization.

20648223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2773 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20648223 is about 4544.0315799959. The cubic root of 20648223 is about 274.3432172268.

The spelling of 20648223 in words is "twenty million, six hundred forty-eight thousand, two hundred twenty-three".