20975668 has 24 divisors (see below), whose sum is σ = 42389312. Its totient is φ = 8895744.

The previous prime is 20975663. The next prime is 20975683. The reversal of 20975668 is 86657902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146 + ... + 6577.

Almost surely, 2^20975668 is an apocalyptic number.

20975668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20975668 is an abundant number, since it is smaller than the sum of its proper divisors (21413644).

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

20975668 is a wasteful number, since it uses less digits than its factorization.

20975668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7831 (or 7829 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 20975668 is about 4579.9200866391. The cubic root of 20975668 is about 275.7858206748.

The spelling of 20975668 in words is "twenty million, nine hundred seventy-five thousand, six hundred sixty-eight".