20121888 has 48 divisors (see below), whose sum is σ = 53101440. Its totient is φ = 6671616.

The previous prime is 20121869. The next prime is 20121901. The reversal of 20121888 is 88812102.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22506 + ... + 23382.

It is an arithmetic number, because the mean of its divisors is an integer number (1106280).

Almost surely, 2^20121888 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 20121888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26550720).

20121888 is an abundant number, since it is smaller than the sum of its proper divisors (32979552).

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

20121888 is a wasteful number, since it uses less digits than its factorization.

20121888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 20121888 is about 4485.7427478624. The cubic root of 20121888 is about 271.9920701264.

The spelling of 20121888 in words is "twenty million, one hundred twenty-one thousand, eight hundred eighty-eight".