20136636066 has 32 divisors (see below), whose sum is σ = 41229131328. Its totient is φ = 6553048320.

The previous prime is 20136636043. The next prime is 20136636067. The reversal of 20136636066 is 66063663102.

It is a happy number.

It is a super-2 number, since 2×20136636066² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20136636067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571390 + ... + 605606.

It is an arithmetic number, because the mean of its divisors is an integer number (1288410354).

Almost surely, 2^20136636066 is an apocalyptic number.

20136636066 is an abundant number, since it is smaller than the sum of its proper divisors (21092495262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20136636066 is a wasteful number, since it uses less digits than its factorization.

20136636066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36546.

The product of its (nonzero) digits is 139968, while the sum is 39.

The spelling of 20136636066 in words is "twenty billion, one hundred thirty-six million, six hundred thirty-six thousand, sixty-six".