20942688 has 96 divisors (see below), whose sum is σ = 60159456. Its totient is φ = 6340608.

The previous prime is 20942671. The next prime is 20942711. The reversal of 20942688 is 88624902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120970 + ... + 121142.

It is an arithmetic number, because the mean of its divisors is an integer number (626661).

Almost surely, 2^20942688 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 20942688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30079728).

20942688 is an abundant number, since it is smaller than the sum of its proper divisors (39216768).

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

20942688 is a wasteful number, since it uses less digits than its factorization.

20942688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 20942688 is about 4576.3181707569. The cubic root of 20942688 is about 275.6412056946.

The spelling of 20942688 in words is "twenty million, nine hundred forty-two thousand, six hundred eighty-eight".