20653990720 has 112 divisors (see below), whose sum is σ = 53698615488. Its totient is φ = 7504220160.

The previous prime is 20653990673. The next prime is 20653990729. The reversal of 20653990720 is 2709935602.

It is a super-2 number, since 2×20653990720² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20653990729) 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, 6992764 + ... + 6995716.

It is an arithmetic number, because the mean of its divisors is an integer number (479451924).

Almost surely, 2^20653990720 is an apocalyptic number.

20653990720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20653990720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26849307744).

20653990720 is an abundant number, since it is smaller than the sum of its proper divisors (33044624768).

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

20653990720 is a wasteful number, since it uses less digits than its factorization.

20653990720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4968 (or 4958 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 20653990720 in words is "twenty billion, six hundred fifty-three million, nine hundred ninety thousand, seven hundred twenty".