20647065 has 8 divisors (see below), whose sum is σ = 33035328. Its totient is φ = 11011760.

The previous prime is 20647049. The next prime is 20647093. The reversal of 20647065 is 56074602.

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

It is not a de Polignac number, because 20647065 - 2⁴ = 20647049 is a prime.

It is a super-2 number, since 2×20647065² = 852602586228450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688221 + ... + 688250.

It is an arithmetic number, because the mean of its divisors is an integer number (4129416).

Almost surely, 2^20647065 is an apocalyptic number.

It is an amenable number.

20647065 is a deficient number, since it is larger than the sum of its proper divisors (12388263).

20647065 is a wasteful number, since it uses less digits than its factorization.

20647065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376479.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20647065 is about 4543.9041583202. The cubic root of 20647065 is about 274.3380885307.

The spelling of 20647065 in words is "twenty million, six hundred forty-seven thousand, sixty-five".