20995541328 has 20 divisors (see below), whose sum is σ = 54238481888. Its totient is φ = 6998513760.

The previous prime is 20995541327. The next prime is 20995541339. The reversal of 20995541328 is 82314559902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 437407111 = 20995541328 / (2 + 0 + 9 + 9 + 5 + 5 + 4 + 1 + 3 + 2 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20995541327) 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, 218703508 + ... + 218703603.

Almost surely, 2^20995541328 is an apocalyptic number.

It is an amenable number.

20995541328 is an abundant number, since it is smaller than the sum of its proper divisors (33242940560).

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

20995541328 is a wasteful number, since it uses less digits than its factorization.

20995541328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437407122 (or 437407116 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 20995541328 in words is "twenty billion, nine hundred ninety-five million, five hundred forty-one thousand, three hundred twenty-eight".