20688342 has 16 divisors (see below), whose sum is σ = 41513472. Its totient is φ = 6873320.

The previous prime is 20688341. The next prime is 20688433. The reversal of 20688342 is 24388602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688341) 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, 3678 + ... + 7409.

It is an arithmetic number, because the mean of its divisors is an integer number (2594592).

Almost surely, 2^20688342 is an apocalyptic number.

20688342 is an abundant number, since it is smaller than the sum of its proper divisors (20825130).

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

20688342 is a wasteful number, since it uses less digits than its factorization.

20688342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11403.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 20688342 is about 4548.4439097344. The cubic root of 20688342 is about 274.5207830290.

The spelling of 20688342 in words is "twenty million, six hundred eighty-eight thousand, three hundred forty-two".