20997919632 has 80 divisors (see below), whose sum is σ = 54660787200. Its totient is φ = 6945792000.

The previous prime is 20997919619. The next prime is 20997919633. The reversal of 20997919632 is 23691979902.

It is not an unprimeable number, because it can be changed into a prime (20997919633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4113882 + ... + 4118982.

It is an arithmetic number, because the mean of its divisors is an integer number (683259840).

Almost surely, 2^20997919632 is an apocalyptic number.

It is an amenable number.

20997919632 is an abundant number, since it is smaller than the sum of its proper divisors (33662867568).

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

20997919632 is a wasteful number, since it uses less digits than its factorization.

20997919632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752 (or 5746 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 57.

The spelling of 20997919632 in words is "twenty billion, nine hundred ninety-seven million, nine hundred nineteen thousand, six hundred thirty-two".