20536633387661 has 8 divisors (see below), whose sum is σ = 20768049509760. Its totient is φ = 20305232097568.

The previous prime is 20536633387639. The next prime is 20536633387663. The reversal of 20536633387661 is 16678333663502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20536633387661 - 2⁶ = 20536633387597 is a prime.

It is a super-2 number, since 2×20536633387661² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20536633387661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536633387663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911351 + ... + 6473316.

It is an arithmetic number, because the mean of its divisors is an integer number (2596006188720).

Almost surely, 2^{20536633387661} is an apocalyptic number.

It is an amenable number.

20536633387661 is a deficient number, since it is larger than the sum of its proper divisors (231416122099).

20536633387661 is an equidigital number, since it uses as much as digits as its factorization.

20536633387661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7416003.

The product of its (nonzero) digits is 58786560, while the sum is 59.

The spelling of 20536633387661 in words is "twenty trillion, five hundred thirty-six billion, six hundred thirty-three million, three hundred eighty-seven thousand, six hundred sixty-one".