20121968 has 20 divisors (see below), whose sum is σ = 39537648. Its totient is φ = 9918720.

The previous prime is 20121967. The next prime is 20121973. The reversal of 20121968 is 86912102.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20121968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7721 + ... + 9992.

Almost surely, 2^20121968 is an apocalyptic number.

It is an amenable number.

20121968 is a deficient number, since it is larger than the sum of its proper divisors (19415680).

20121968 is a wasteful number, since it uses less digits than its factorization.

20121968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17792 (or 17786 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 20121968 is about 4485.7516649944. The cubic root of 20121968 is about 271.9924305852.

The spelling of 20121968 in words is "twenty million, one hundred twenty-one thousand, nine hundred sixty-eight".