20969913840 has 80 divisors (see below), whose sum is σ = 65052979200. Its totient is φ = 5587998976.

The previous prime is 20969913793. The next prime is 20969913869. The reversal of 20969913840 is 4831996902.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×20969913840³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315001 + ... + 375719.

It is an arithmetic number, because the mean of its divisors is an integer number (813162240).

Almost surely, 2^20969913840 is an apocalyptic number.

20969913840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20969913840 is an abundant number, since it is smaller than the sum of its proper divisors (44083065360).

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

20969913840 is a wasteful number, since it uses less digits than its factorization.

20969913840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62174 (or 62168 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 20969913840 in words is "twenty billion, nine hundred sixty-nine million, nine hundred thirteen thousand, eight hundred forty".