20867206553818 has 16 divisors (see below), whose sum is σ = 32696572426560. Its totient is φ = 9969317351136.

The previous prime is 20867206553797. The next prime is 20867206553863. The reversal of 20867206553818 is 81835560276802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242024628 + ... + 242110831.

It is an arithmetic number, because the mean of its divisors is an integer number (2043535776660).

Almost surely, 2^{20867206553818} is an apocalyptic number.

20867206553818 is a deficient number, since it is larger than the sum of its proper divisors (11829365872742).

20867206553818 is a wasteful number, since it uses less digits than its factorization.

20867206553818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484136421.

The product of its (nonzero) digits is 38707200, while the sum is 61.

The spelling of 20867206553818 in words is "twenty trillion, eight hundred sixty-seven billion, two hundred six million, five hundred fifty-three thousand, eight hundred eighteen".