20688346 has 32 divisors (see below), whose sum is σ = 37168128. Its totient is φ = 8449920.

The previous prime is 20688341. The next prime is 20688433. The reversal of 20688346 is 64388602.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 15 ways as a sum of consecutive naturals, for example, 31356 + ... + 32008.

It is an arithmetic number, because the mean of its divisors is an integer number (1161504).

Almost surely, 2^20688346 is an apocalyptic number.

20688346 is a deficient number, since it is larger than the sum of its proper divisors (16479782).

20688346 is a wasteful number, since it uses less digits than its factorization.

20688346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20688346 is about 4548.4443494452. Note that the first 3 decimals coincide. The cubic root of 20688346 is about 274.5208007215.

The spelling of 20688346 in words is "twenty million, six hundred eighty-eight thousand, three hundred forty-six".