20628274813 has 4 divisors (see below), whose sum is σ = 20778846300. Its totient is φ = 20477703328.

The previous prime is 20628274783. The next prime is 20628274853. The reversal of 20628274813 is 31847282602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11017021444 + 9611253369 = 104962^2 + 98037^2 .

It is a cyclic number.

It is not a de Polignac number, because 20628274813 - 2²⁵ = 20594720381 is a prime.

It is a super-3 number, since 3×20628274813³ (a number of 32 digits) contains 333 as substring.

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 20628274813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628274853) 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, 75285538 + ... + 75285811.

It is an arithmetic number, because the mean of its divisors is an integer number (5194711575).

Almost surely, 2^20628274813 is an apocalyptic number.

It is an amenable number.

20628274813 is a deficient number, since it is larger than the sum of its proper divisors (150571487).

20628274813 is a wasteful number, since it uses less digits than its factorization.

20628274813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150571486.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 20628274813 in words is "twenty billion, six hundred twenty-eight million, two hundred seventy-four thousand, eight hundred thirteen".