20628913623 has 4 divisors (see below), whose sum is σ = 27505218168. Its totient is φ = 13752609080.

The previous prime is 20628913589. The next prime is 20628913633. The reversal of 20628913623 is 32631982602.

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

It is a cyclic number.

It is not a de Polignac number, because 20628913623 - 2¹² = 20628909527 is a prime.

It is a super-2 number, since 2×20628913623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628913633) 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, 3438152268 + ... + 3438152273.

It is an arithmetic number, because the mean of its divisors is an integer number (6876304542).

Almost surely, 2^20628913623 is an apocalyptic number.

20628913623 is a deficient number, since it is larger than the sum of its proper divisors (6876304545).

20628913623 is an equidigital number, since it uses as much as digits as its factorization.

20628913623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876304544.

The product of its (nonzero) digits is 186624, while the sum is 42.

It can be divided in two parts, 206289 and 13623, that added together give a palindrome (219912).

The spelling of 20628913623 in words is "twenty billion, six hundred twenty-eight million, nine hundred thirteen thousand, six hundred twenty-three".