20051688 has 32 divisors (see below), whose sum is σ = 52768800. Its totient is φ = 6331968.

The previous prime is 20051683. The next prime is 20051711. The reversal of 20051688 is 88615002.

It is not an unprimeable number, because it can be changed into a prime (20051683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21531 + ... + 22442.

It is an arithmetic number, because the mean of its divisors is an integer number (1649025).

Almost surely, 2^20051688 is an apocalyptic number.

It is an amenable number.

20051688 is an abundant number, since it is smaller than the sum of its proper divisors (32717112).

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

20051688 is a wasteful number, since it uses less digits than its factorization.

20051688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44001 (or 43997 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 20051688 is about 4477.9111201541. The cubic root of 20051688 is about 271.6753985342.

The spelling of 20051688 in words is "twenty million, fifty-one thousand, six hundred eighty-eight".