20696688 has 80 divisors (see below), whose sum is σ = 62019840. Its totient is φ = 6595776.

The previous prime is 20696587. The next prime is 20696699. The reversal of 20696688 is 88669602.

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, 8895 + ... + 10977.

It is an arithmetic number, because the mean of its divisors is an integer number (775248).

Almost surely, 2^20696688 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 20696688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31009920).

20696688 is an abundant number, since it is smaller than the sum of its proper divisors (41323152).

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

20696688 is a wasteful number, since it uses less digits than its factorization.

20696688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123 (or 2111 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 20696688 is about 4549.3612738493. The cubic root of 20696688 is about 274.5576933886.

The spelling of 20696688 in words is "twenty million, six hundred ninety-six thousand, six hundred eighty-eight".