20657417 has 8 divisors (see below), whose sum is σ = 22736160. Its totient is φ = 18612160.

The previous prime is 20657407. The next prime is 20657419. The reversal of 20657417 is 71475602.

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

It is a cyclic number.

It is not a de Polignac number, because 20657417 - 2⁴ = 20657401 is a prime.

It is a super-2 number, since 2×20657417² = 853457754223778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20657419) 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, 7067 + ... + 9552.

It is an arithmetic number, because the mean of its divisors is an integer number (2842020).

Almost surely, 2^20657417 is an apocalyptic number.

It is an amenable number.

20657417 is a deficient number, since it is larger than the sum of its proper divisors (2078743).

20657417 is a wasteful number, since it uses less digits than its factorization.

20657417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16743.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20657417 is about 4545.0431241078. The cubic root of 20657417 is about 274.3839299678.

The spelling of 20657417 in words is "twenty million, six hundred fifty-seven thousand, four hundred seventeen".