20169272784 has 80 divisors (see below), whose sum is σ = 52895969600. Its totient is φ = 6621170688.

The previous prime is 20169272741. The next prime is 20169272867. The reversal of 20169272784 is 48727296102.

It is a super-2 number, since 2×20169272784² (a number of 21 digits) contains 22 as substring.

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

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 15 ways as a sum of consecutive naturals, for example, 2585562 + ... + 2593350.

It is an arithmetic number, because the mean of its divisors is an integer number (661199620).

Almost surely, 2^20169272784 is an apocalyptic number.

20169272784 is a gapful number since it is divisible by the number (24) 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 20169272784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26447984800).

20169272784 is an abundant number, since it is smaller than the sum of its proper divisors (32726696816).

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

20169272784 is a wasteful number, since it uses less digits than its factorization.

20169272784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8612 (or 8606 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 20169272784 in words is "twenty billion, one hundred sixty-nine million, two hundred seventy-two thousand, seven hundred eighty-four".