20002688 has 48 divisors (see below), whose sum is σ = 41722080. Its totient is φ = 9542400.

The previous prime is 20002679. The next prime is 20002691. The reversal of 20002688 is 88620002.

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, 281693 + ... + 281763.

It is an arithmetic number, because the mean of its divisors is an integer number (869210).

Almost surely, 2^20002688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20002688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20861040).

20002688 is an abundant number, since it is smaller than the sum of its proper divisors (21719392).

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

20002688 is an frugal number, since it uses more digits than its factorization.

20002688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20002688 is about 4472.4364724387. The cubic root of 20002688 is about 271.4539217057.

The spelling of 20002688 in words is "twenty million, two thousand, six hundred eighty-eight".