20156878433 has 8 divisors (see below), whose sum is σ = 20542945896. Its totient is φ = 19771024000.

The previous prime is 20156878429. The next prime is 20156878439. The reversal of 20156878433 is 33487865102.

It can be written as a sum of positive squares in 4 ways, for example, as 10203424144 + 9953454289 = 101012^2 + 99767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20156878433 - 2² = 20156878429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20156878439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144773 + ... + 247533.

It is an arithmetic number, because the mean of its divisors is an integer number (2567868237).

Almost surely, 2^20156878433 is an apocalyptic number.

It is an amenable number.

20156878433 is a deficient number, since it is larger than the sum of its proper divisors (386067463).

20156878433 is a wasteful number, since it uses less digits than its factorization.

20156878433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106515.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 20156878433 in words is "twenty billion, one hundred fifty-six million, eight hundred seventy-eight thousand, four hundred thirty-three".