20971608 has 96 divisors (see below), whose sum is σ = 64638000. Its totient is φ = 5634048.

The previous prime is 20971583. The next prime is 20971619. The reversal of 20971608 is 80617902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19468 + ... + 20516.

Almost surely, 2^20971608 is an apocalyptic number.

20971608 is a gapful number since it is divisible by the number (28) 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 20971608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32319000).

20971608 is an abundant number, since it is smaller than the sum of its proper divisors (43666392).

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

20971608 is a wasteful number, since it uses less digits than its factorization.

20971608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20971608 is about 4579.4768260141. The cubic root of 20971608 is about 275.7680260459.

It can be divided in two parts, 209 and 71608, that added together give a palindrome (71817).

The spelling of 20971608 in words is "twenty million, nine hundred seventy-one thousand, six hundred eight".