20688412 has 12 divisors (see below), whose sum is σ = 36240400. Its totient is φ = 10334016.

The previous prime is 20688341. The next prime is 20688433. The reversal of 20688412 is 21488602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3748 + ... + 7444.

Almost surely, 2^20688412 is an apocalyptic number.

It is an amenable number.

20688412 is a deficient number, since it is larger than the sum of its proper divisors (15551988).

20688412 is a wasteful number, since it uses less digits than its factorization.

20688412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100 (or 5098 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20688412 is about 4548.4516046672. The cubic root of 20688412 is about 274.5210926467.

The spelling of 20688412 in words is "twenty million, six hundred eighty-eight thousand, four hundred twelve".