20420133164 has 12 divisors (see below), whose sum is σ = 35798040600. Its totient is φ = 10192121568.

The previous prime is 20420133133. The next prime is 20420133191. The reversal of 20420133164 is 46133102402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4483694 + ... + 4488245.

It is an arithmetic number, because the mean of its divisors is an integer number (2983170050).

Almost surely, 2^20420133164 is an apocalyptic number.

It is an amenable number.

20420133164 is a deficient number, since it is larger than the sum of its proper divisors (15377907436).

20420133164 is a wasteful number, since it uses less digits than its factorization.

20420133164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8972512 (or 8972510 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 20420133164 its reverse (46133102402), we get a palindrome (66553235566).

The spelling of 20420133164 in words is "twenty billion, four hundred twenty million, one hundred thirty-three thousand, one hundred sixty-four".