20191608 has 96 divisors (see below), whose sum is σ = 58125600. Its totient is φ = 6319104.

The previous prime is 20191579. The next prime is 20191621. The reversal of 20191608 is 80619102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147316 + ... + 147452.

It is an arithmetic number, because the mean of its divisors is an integer number (605475).

Almost surely, 2^20191608 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 20191608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29062800).

20191608 is an abundant number, since it is smaller than the sum of its proper divisors (37933992).

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

20191608 is a wasteful number, since it uses less digits than its factorization.

20191608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20191608 is about 4493.5073161173. The cubic root of 20191608 is about 272.3058482922.

It can be divided in two parts, 201 and 91608, that added together give a square (91809 = 303²).

The spelling of 20191608 in words is "twenty million, one hundred ninety-one thousand, six hundred eight".