20645113132 has 12 divisors (see below), whose sum is σ = 41290226320. Its totient is φ = 8847905616.

The previous prime is 20645113129. The next prime is 20645113189. The reversal of 20645113132 is 23131154602.

20645113132 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 737325469 = 20645113132 / (2 + 0 + 6 + 4 + 5 + 1 + 1 + 3 + 1 + 3 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 20645113132.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368662707 + ... + 368662762.

Almost surely, 2^20645113132 is an apocalyptic number.

It is an amenable number.

20645113132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20645113132 is a wasteful number, since it uses less digits than its factorization.

20645113132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737325480 (or 737325478 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 20645113132 its reverse (23131154602), we get a palindrome (43776267734).

The spelling of 20645113132 in words is "twenty billion, six hundred forty-five million, one hundred thirteen thousand, one hundred thirty-two".