20093784840 has 96 divisors (see below), whose sum is σ = 65416740480. Its totient is φ = 5349158016.

The previous prime is 20093784827. The next prime is 20093784847. The reversal of 20093784840 is 4848739002.

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 (20093784847) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 163777 + ... + 258863.

It is an arithmetic number, because the mean of its divisors is an integer number (681424380).

Almost surely, 2^20093784840 is an apocalyptic number.

20093784840 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 20093784840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32708370240).

20093784840 is an abundant number, since it is smaller than the sum of its proper divisors (45322955640).

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

20093784840 is a wasteful number, since it uses less digits than its factorization.

20093784840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95691 (or 95684 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 20093784840 in words is "twenty billion, ninety-three million, seven hundred eighty-four thousand, eight hundred forty".