20855133331047 has 12 divisors (see below), whose sum is σ = 30136786731064. Its totient is φ = 13897558257840.

The previous prime is 20855133331013. The next prime is 20855133331073. The reversal of 20855133331047 is 74013333155802.

20855133331047 is a `hidden beast` number, since 2 + 0 + 85 + 513 + 3 + 3 + 3 + 10 + 47 = 666.

It is not a de Polignac number, because 20855133331047 - 2²³ = 20855124942439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20855133330993 and 20855133331011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855133331547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 488641048 + ... + 488683725.

Almost surely, 2^{20855133331047} is an apocalyptic number.

20855133331047 is a deficient number, since it is larger than the sum of its proper divisors (9281653400017).

20855133331047 is a wasteful number, since it uses less digits than its factorization.

20855133331047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977327150 (or 977327147 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

Adding to 20855133331047 its reverse (74013333155802), we get a palindrome (94868466486849).

The spelling of 20855133331047 in words is "twenty trillion, eight hundred fifty-five billion, one hundred thirty-three million, three hundred thirty-one thousand, forty-seven".