20906577133 has 12 divisors (see below), whose sum is σ = 22662561888. Its totient is φ = 19277852880.

The previous prime is 20906577127. The next prime is 20906577157. The reversal of 20906577133 is 33177560902.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20906577133 is a prime.

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 20906577133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906577163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94728 + ... + 225358.

It is an arithmetic number, because the mean of its divisors is an integer number (1888546824).

Almost surely, 2^20906577133 is an apocalyptic number.

It is an amenable number.

20906577133 is a deficient number, since it is larger than the sum of its proper divisors (1755984755).

20906577133 is a wasteful number, since it uses less digits than its factorization.

20906577133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131604 (or 131591 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 20906577133 in words is "twenty billion, nine hundred six million, five hundred seventy-seven thousand, one hundred thirty-three".