20428888533 has 8 divisors (see below), whose sum is σ = 27871972128. Its totient is φ = 13302531984.

The previous prime is 20428888507. The next prime is 20428888561. The reversal of 20428888533 is 33588882402.

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

It is not a de Polignac number, because 20428888533 - 2¹³ = 20428880341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428888573) 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, 79181610 + ... + 79181867.

It is an arithmetic number, because the mean of its divisors is an integer number (3483996516).

Almost surely, 2^20428888533 is an apocalyptic number.

It is an amenable number.

20428888533 is a deficient number, since it is larger than the sum of its proper divisors (7443083595).

20428888533 is a wasteful number, since it uses less digits than its factorization.

20428888533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158363523.

The product of its (nonzero) digits is 2949120, while the sum is 51.

The spelling of 20428888533 in words is "twenty billion, four hundred twenty-eight million, eight hundred eighty-eight thousand, five hundred thirty-three".