20688117 has 8 divisors (see below), whose sum is σ = 28225824. Its totient is φ = 13471248.

The previous prime is 20688113. The next prime is 20688121. The reversal of 20688117 is 71188602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20688113) and next prime (20688121).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20688117 - 2² = 20688113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688113) 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, 80058 + ... + 80315.

It is an arithmetic number, because the mean of its divisors is an integer number (3528228).

Almost surely, 2^20688117 is an apocalyptic number.

It is an amenable number.

20688117 is a deficient number, since it is larger than the sum of its proper divisors (7537707).

20688117 is a wasteful number, since it uses less digits than its factorization.

20688117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160419.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 20688117 is about 4548.4191759335. The cubic root of 20688117 is about 274.5197878244.

The spelling of 20688117 in words is "twenty million, six hundred eighty-eight thousand, one hundred seventeen".