20656065 has 8 divisors (see below), whose sum is σ = 33049728. Its totient is φ = 11016560.

The previous prime is 20656057. The next prime is 20656067. The reversal of 20656065 is 56065602.

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

It is not a de Polignac number, because 20656065 - 2³ = 20656057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20656067) 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, 688521 + ... + 688550.

It is an arithmetic number, because the mean of its divisors is an integer number (4131216).

Almost surely, 2^20656065 is an apocalyptic number.

It is an amenable number.

20656065 is a deficient number, since it is larger than the sum of its proper divisors (12393663).

20656065 is a wasteful number, since it uses less digits than its factorization.

20656065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377079.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20656065 is about 4544.8943882119. The cubic root of 20656065 is about 274.3779438182.

It can be divided in two parts, 20 and 656065, that added together give a triangular number (656085 = T₁₁₄₅).

The spelling of 20656065 in words is "twenty million, six hundred fifty-six thousand, sixty-five".