20169799372800 has 4368 divisors, whose sum is σ = 97514927038080. Its totient is φ = 4046605516800.

The previous prime is 20169799372783. The next prime is 20169799372819. The reversal of 20169799372800 is 827399796102.

20169799372800 is a `hidden beast` number, since 2 + 0 + 16 + 97 + 99 + 372 + 80 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 695510323186 + ... + 695510323214.

Almost surely, 2^{20169799372800} is an apocalyptic number.

20169799372800 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 20169799372800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48757463519040).

20169799372800 is an abundant number, since it is smaller than the sum of its proper divisors (77345127665280).

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

20169799372800 is an frugal number, since it uses more digits than its factorization.

20169799372800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 63.

The spelling of 20169799372800 in words is "twenty trillion, one hundred sixty-nine billion, seven hundred ninety-nine million, three hundred seventy-two thousand, eight hundred".