20191536 has 60 divisors (see below), whose sum is σ = 56823000. Its totient is φ = 6693120.

The previous prime is 20191517. The next prime is 20191537. The reversal of 20191536 is 63519102.

It is not an unprimeable number, because it can be changed into a prime (20191537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40215 + ... + 40713.

It is an arithmetic number, because the mean of its divisors is an integer number (947050).

Almost surely, 2^20191536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20191536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28411500).

20191536 is an abundant number, since it is smaller than the sum of its proper divisors (36631464).

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

20191536 is a wasteful number, since it uses less digits than its factorization.

20191536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20191536 is about 4493.4993045510. The cubic root of 20191536 is about 272.3055246257.

The spelling of 20191536 in words is "twenty million, one hundred ninety-one thousand, five hundred thirty-six".