20648895 has 16 divisors (see below), whose sum is σ = 33095520. Its totient is φ = 10993664.

The previous prime is 20648893. The next prime is 20648909. The reversal of 20648895 is 59884602.

It is a cyclic number.

It is not a de Polignac number, because 20648895 - 2¹ = 20648893 is a prime.

It is a super-3 number, since 3×20648895³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648891) 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, 13951 + ... + 15359.

It is an arithmetic number, because the mean of its divisors is an integer number (2068470).

Almost surely, 2^20648895 is an apocalyptic number.

20648895 is a deficient number, since it is larger than the sum of its proper divisors (12446625).

20648895 is a wasteful number, since it uses less digits than its factorization.

20648895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20648895 is about 4544.1055225424. The cubic root of 20648895 is about 274.3461933771.

The spelling of 20648895 in words is "twenty million, six hundred forty-eight thousand, eight hundred ninety-five".