20191244578 has 32 divisors (see below), whose sum is σ = 30795069888. Its totient is φ = 9928089600.

The previous prime is 20191244569. The next prime is 20191244599. The reversal of 20191244578 is 87544219102.

It is a super-2 number, since 2×20191244578² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15284158 + ... + 15285478.

It is an arithmetic number, because the mean of its divisors is an integer number (962345934).

Almost surely, 2^20191244578 is an apocalyptic number.

20191244578 is a deficient number, since it is larger than the sum of its proper divisors (10603825310).

20191244578 is a wasteful number, since it uses less digits than its factorization.

20191244578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 20191244578 in words is "twenty billion, one hundred ninety-one million, two hundred forty-four thousand, five hundred seventy-eight".