20506162065 has 16 divisors (see below), whose sum is σ = 32817353856. Its totient is φ = 10934121600.

The previous prime is 20506162037. The next prime is 20506162081. The reversal of 20506162065 is 56026160502.

It is a happy number.

It is not a de Polignac number, because 20506162065 - 2²¹ = 20504064913 is a prime.

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, 87301 + ... + 220530.

It is an arithmetic number, because the mean of its divisors is an integer number (2051084616).

Almost surely, 2^20506162065 is an apocalyptic number.

It is an amenable number.

20506162065 is a deficient number, since it is larger than the sum of its proper divisors (12311191791).

20506162065 is a wasteful number, since it uses less digits than its factorization.

20506162065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312280.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 20506162065 in words is "twenty billion, five hundred six million, one hundred sixty-two thousand, sixty-five".