20656005 has 16 divisors (see below), whose sum is σ = 33856704. Its totient is φ = 10747520.

The previous prime is 20655997. The next prime is 20656057. The reversal of 20656005 is 50065602.

It is not a de Polignac number, because 20656005 - 2³ = 20655997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16179 + ... + 17408.

It is an arithmetic number, because the mean of its divisors is an integer number (2116044).

Almost surely, 2^20656005 is an apocalyptic number.

It is an amenable number.

20656005 is a deficient number, since it is larger than the sum of its proper divisors (13200699).

20656005 is a wasteful number, since it uses less digits than its factorization.

20656005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33636.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20656005 is about 4544.8877873937. The cubic root of 20656005 is about 274.3776781546.

The spelling of 20656005 in words is "twenty million, six hundred fifty-six thousand, five".