20623643128 has 32 divisors (see below), whose sum is σ = 44018847360. Its totient is φ = 8966800480.

The previous prime is 20623643111. The next prime is 20623643129. The reversal of 20623643128 is 82134632602.

It is a super-2 number, since 2×20623643128² (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 (20623643129) 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, 5092750 + ... + 5096797.

It is an arithmetic number, because the mean of its divisors is an integer number (1375588980).

Almost surely, 2^20623643128 is an apocalyptic number.

It is an amenable number.

20623643128 is an abundant number, since it is smaller than the sum of its proper divisors (23395204232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20623643128 is a wasteful number, since it uses less digits than its factorization.

20623643128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10189587 (or 10189583 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 20623643128 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, one hundred twenty-eight".