20636409105 has 96 divisors (see below), whose sum is σ = 41039107200. Its totient is φ = 9508368384.

The previous prime is 20636409103. The next prime is 20636409139. The reversal of 20636409105 is 50190463602.

It is a happy number.

20636409105 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 640 + 9 + 1 + 0 + 5 = 666.

It is not a de Polignac number, because 20636409105 - 2¹ = 20636409103 is a prime.

It is a super-2 number, since 2×20636409105² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20636409105.

It is not an unprimeable number, because it can be changed into a prime (20636409103) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 911361 + ... + 933729.

It is an arithmetic number, because the mean of its divisors is an integer number (427490700).

Almost surely, 2^20636409105 is an apocalyptic number.

It is an amenable number.

20636409105 is a deficient number, since it is larger than the sum of its proper divisors (20402698095).

20636409105 is a wasteful number, since it uses less digits than its factorization.

20636409105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22495 (or 22492 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 20636409105 in words is "twenty billion, six hundred thirty-six million, four hundred nine thousand, one hundred five".