20406265305 has 16 divisors (see below), whose sum is σ = 32652267264. Its totient is φ = 10882593920.

The previous prime is 20406265303. The next prime is 20406265337. The reversal of 20406265305 is 50356260402.

It is not a de Polignac number, because 20406265305 - 2¹ = 20406265303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20406265303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232912 + ... + 308318.

It is an arithmetic number, because the mean of its divisors is an integer number (2040766704).

Almost surely, 2^20406265305 is an apocalyptic number.

It is an amenable number.

20406265305 is a deficient number, since it is larger than the sum of its proper divisors (12246001959).

20406265305 is a wasteful number, since it uses less digits than its factorization.

20406265305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93456.

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 20406265305 in words is "twenty billion, four hundred six million, two hundred sixty-five thousand, three hundred five".