20997523068 has 24 divisors (see below), whose sum is σ = 49479314640. Its totient is φ = 6929875200.

The previous prime is 20997522979. The next prime is 20997523073. The reversal of 20997523068 is 86032579902.

It is a self number, because there is not a number n which added to its sum of digits gives 20997523068.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8661133 + ... + 8663556.

It is an arithmetic number, because the mean of its divisors is an integer number (2061638110).

Almost surely, 2^20997523068 is an apocalyptic number.

It is an amenable number.

20997523068 is an abundant number, since it is smaller than the sum of its proper divisors (28481791572).

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

20997523068 is a wasteful number, since it uses less digits than its factorization.

20997523068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17324797 (or 17324795 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 20997523068 in words is "twenty billion, nine hundred ninety-seven million, five hundred twenty-three thousand, sixty-eight".