20967217920 has 432 divisors, whose sum is σ = 83803198752. Its totient is φ = 4783472640.

The previous prime is 20967217883. The next prime is 20967217927. The reversal of 20967217920 is 2971276902.

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

It is not an unprimeable number, because it can be changed into a prime (20967217927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2149374 + ... + 2159106.

It is an arithmetic number, because the mean of its divisors is an integer number (193988886).

Almost surely, 2^20967217920 is an apocalyptic number.

20967217920 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 20967217920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41901599376).

20967217920 is an abundant number, since it is smaller than the sum of its proper divisors (62835980832).

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

20967217920 is a wasteful number, since it uses less digits than its factorization.

20967217920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9788 (or 9771 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 20967217920 in words is "twenty billion, nine hundred sixty-seven million, two hundred seventeen thousand, nine hundred twenty".