20205648 has 30 divisors (see below), whose sum is σ = 56548154. Its totient is φ = 6735168.

The previous prime is 20205623. The next prime is 20205697. The reversal of 20205648 is 84650202.

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 63504 = 4488^2 + 252^2 .

It is a super-2 number, since 2×20205648² = 816536422199808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70015 + ... + 70302.

Almost surely, 2^20205648 is an apocalyptic number.

It is an amenable number.

20205648 is an abundant number, since it is smaller than the sum of its proper divisors (36342506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20205648 is a wasteful number, since it uses less digits than its factorization.

20205648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140331 (or 140322 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20205648 is about 4495.0692986872. The cubic root of 20205648 is about 272.3689485716.

The spelling of 20205648 in words is "twenty million, two hundred five thousand, six hundred forty-eight".