20943369720 has 640 divisors, whose sum is σ = 87290058240. Its totient is φ = 4385664000.

The previous prime is 20943369679. The next prime is 20943369743. The reversal of 20943369720 is 2796334902.

20943369720 is a `hidden beast` number, since 209 + 4 + 336 + 97 + 20 = 666.

It is a super-2 number, since 2×20943369720² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 74004699 + ... + 74004981.

It is an arithmetic number, because the mean of its divisors is an integer number (136390716).

Almost surely, 2^20943369720 is an apocalyptic number.

20943369720 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 20943369720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43645029120).

20943369720 is an abundant number, since it is smaller than the sum of its proper divisors (66346688520).

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

20943369720 is a wasteful number, since it uses less digits than its factorization.

20943369720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The spelling of 20943369720 in words is "twenty billion, nine hundred forty-three million, three hundred sixty-nine thousand, seven hundred twenty".