20666997120 has 512 divisors, whose sum is σ = 84067061760. Its totient is φ = 4193280000.

The previous prime is 20666997119. The next prime is 20666997259. The reversal of 20666997120 is 2179966602.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20666997120.

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 63 ways as a sum of consecutive naturals, for example, 6355495 + ... + 6358745.

It is an arithmetic number, because the mean of its divisors is an integer number (164193480).

Almost surely, 2^20666997120 is an apocalyptic number.

20666997120 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 20666997120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42033530880).

20666997120 is an abundant number, since it is smaller than the sum of its proper divisors (63400064640).

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

20666997120 is a wasteful number, since it uses less digits than its factorization.

20666997120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334 (or 3322 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 20666997120 in words is "twenty billion, six hundred sixty-six million, nine hundred ninety-seven thousand, one hundred twenty".