20523688 has 8 divisors (see below), whose sum is σ = 38481930. Its totient is φ = 10261840.

The previous prime is 20523673. The next prime is 20523691. The reversal of 20523688 is 88632502.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 3034564 = 4182^2 + 1742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282723 + ... + 1282738.

Almost surely, 2^20523688 is an apocalyptic number.

It is an amenable number.

20523688 is a deficient number, since it is larger than the sum of its proper divisors (17958242).

20523688 is a wasteful number, since it uses less digits than its factorization.

20523688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565467 (or 2565463 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20523688 is about 4530.3077158180. The cubic root of 20523688 is about 273.7905586855.

The spelling of 20523688 in words is "twenty million, five hundred twenty-three thousand, six hundred eighty-eight".