20191968 has 36 divisors (see below), whose sum is σ = 57421728. Its totient is φ = 6730560.

The previous prime is 20191931. The next prime is 20191987. The reversal of 20191968 is 86919102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34768 + ... + 35343.

It is an arithmetic number, because the mean of its divisors is an integer number (1595048).

Almost surely, 2^20191968 is an apocalyptic number.

It is an amenable number.

20191968 is an abundant number, since it is smaller than the sum of its proper divisors (37229760).

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

20191968 is a wasteful number, since it uses less digits than its factorization.

20191968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70127 (or 70116 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 20191968 is about 4493.5473737349. The cubic root of 20191968 is about 272.3074666134.

The spelling of 20191968 in words is "twenty million, one hundred ninety-one thousand, nine hundred sixty-eight".