20628814513 has 4 divisors (see below), whose sum is σ = 20821607280. Its totient is φ = 20436021748.

The previous prime is 20628814489. The next prime is 20628814519. The reversal of 20628814513 is 31541882602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31541882602 = 2 ⋅15770941301.

It is a cyclic number.

It is not a de Polignac number, because 20628814513 - 2¹⁷ = 20628683441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20628814519) 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, 96396223 + ... + 96396436.

It is an arithmetic number, because the mean of its divisors is an integer number (5205401820).

Almost surely, 2^20628814513 is an apocalyptic number.

It is an amenable number.

20628814513 is a deficient number, since it is larger than the sum of its proper divisors (192792767).

20628814513 is a wasteful number, since it uses less digits than its factorization.

20628814513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192792766.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 20628814513 in words is "twenty billion, six hundred twenty-eight million, eight hundred fourteen thousand, five hundred thirteen".