20648100433 has 4 divisors (see below), whose sum is σ = 20664120420. Its totient is φ = 20632080448.

The previous prime is 20648100419. The next prime is 20648100439. The reversal of 20648100433 is 33400184602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33400184602 = 2 ⋅16700092301.

It can be written as a sum of positive squares in 2 ways, for example, as 13872835089 + 6775265344 = 117783^2 + 82312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20648100433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20648100395 and 20648100404.

It is not an unprimeable number, because it can be changed into a prime (20648100439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8008060 + ... + 8010637.

It is an arithmetic number, because the mean of its divisors is an integer number (5166030105).

Almost surely, 2^20648100433 is an apocalyptic number.

It is an amenable number.

20648100433 is a deficient number, since it is larger than the sum of its proper divisors (16019987).

20648100433 is a wasteful number, since it uses less digits than its factorization.

20648100433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16019986.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20648100433 in words is "twenty billion, six hundred forty-eight million, one hundred thousand, four hundred thirty-three".