20943390720 has 576 divisors, whose sum is σ = 81584979840. Its totient is φ = 4492099584.

The previous prime is 20943390709. The next prime is 20943390751. The reversal of 20943390720 is 2709334902.

It is a super-2 number, since 2×20943390720² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62146392 + ... + 62146728.

It is an arithmetic number, because the mean of its divisors is an integer number (141640590).

Almost surely, 2^20943390720 is an apocalyptic number.

20943390720 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 20943390720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40792489920).

20943390720 is an abundant number, since it is smaller than the sum of its proper divisors (60641589120).

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

20943390720 is a wasteful number, since it uses less digits than its factorization.

20943390720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 39.

The spelling of 20943390720 in words is "twenty billion, nine hundred forty-three million, three hundred ninety thousand, seven hundred twenty".