20164566405 has 16 divisors (see below), whose sum is σ = 34161148224. Its totient is φ = 10121821440.

The previous prime is 20164566391. The next prime is 20164566419. The reversal of 20164566405 is 50466546102.

It is an interprime number because it is at equal distance from previous prime (20164566391) and next prime (20164566419).

It is not a de Polignac number, because 20164566405 - 2²² = 20160372101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39538111 + ... + 39538620.

It is an arithmetic number, because the mean of its divisors is an integer number (2135071764).

Almost surely, 2^20164566405 is an apocalyptic number.

It is an amenable number.

20164566405 is a deficient number, since it is larger than the sum of its proper divisors (13996581819).

20164566405 is a wasteful number, since it uses less digits than its factorization.

20164566405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79076756.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 20164566405 in words is "twenty billion, one hundred sixty-four million, five hundred sixty-six thousand, four hundred five".