20688552 has 24 divisors (see below), whose sum is σ = 56031690. Its totient is φ = 6896160.

The previous prime is 20688539. The next prime is 20688589. The reversal of 20688552 is 25588602.

20688552 is a `hidden beast` number, since 20 + 6 + 88 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19660356 + 1028196 = 4434^2 + 1014^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 143599 + ... + 143742.

Almost surely, 2^20688552 is an apocalyptic number.

It is an amenable number.

20688552 is an abundant number, since it is smaller than the sum of its proper divisors (35343138).

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

20688552 is a wasteful number, since it uses less digits than its factorization.

20688552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287353 (or 287346 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20688552 is about 4548.4669944939. The cubic root of 20688552 is about 274.5217118801.

The spelling of 20688552 in words is "twenty million, six hundred eighty-eight thousand, five hundred fifty-two".