20536666213 has 24 divisors (see below), whose sum is σ = 26394662592. Its totient is φ = 15847058304.

The previous prime is 20536666127. The next prime is 20536666231. The reversal of 20536666213 is 31266663502.

It is not a de Polignac number, because 20536666213 - 2⁹ = 20536665701 is a prime.

It is a super-2 number, since 2×20536666213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536666243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516795 + ... + 555112.

It is an arithmetic number, because the mean of its divisors is an integer number (1099777608).

Almost surely, 2^20536666213 is an apocalyptic number.

20536666213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20536666213 is a deficient number, since it is larger than the sum of its proper divisors (5857996379).

20536666213 is a wasteful number, since it uses less digits than its factorization.

20536666213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071961 (or 1071954 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The spelling of 20536666213 in words is "twenty billion, five hundred thirty-six million, six hundred sixty-six thousand, two hundred thirteen".