20636665707 has 24 divisors (see below), whose sum is σ = 32337890256. Its totient is φ = 11670801408.

The previous prime is 20636665667. The next prime is 20636665717. The reversal of 20636665707 is 70756663602.

It is a happy number.

It is not a de Polignac number, because 20636665707 - 2¹⁸ = 20636403563 is a prime.

It is a super-4 number, since 4×20636665707⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (20636665717) 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 23 ways as a sum of consecutive naturals, for example, 709378 + ... + 737895.

It is an arithmetic number, because the mean of its divisors is an integer number (1347412094).

Almost surely, 2^20636665707 is an apocalyptic number.

20636665707 is a deficient number, since it is larger than the sum of its proper divisors (11701224549).

20636665707 is a wasteful number, since it uses less digits than its factorization.

20636665707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447387 (or 1447380 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 48.

The spelling of 20636665707 in words is "twenty billion, six hundred thirty-six million, six hundred sixty-five thousand, seven hundred seven".