20648243 has 16 divisors (see below), whose sum is σ = 25877760. Its totient is φ = 16005600.

The previous prime is 20648237. The next prime is 20648279. The reversal of 20648243 is 34284602.

It is a cyclic number.

It is not a de Polignac number, because 20648243 - 2⁸ = 20647987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20648233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17048 + ... + 18218.

It is an arithmetic number, because the mean of its divisors is an integer number (1617360).

Almost surely, 2^20648243 is an apocalyptic number.

20648243 is a deficient number, since it is larger than the sum of its proper divisors (5229517).

20648243 is a wasteful number, since it uses less digits than its factorization.

20648243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 20648243 is about 4544.0337806843. The cubic root of 20648243 is about 274.3433058036.

The spelling of 20648243 in words is "twenty million, six hundred forty-eight thousand, two hundred forty-three".