20959888 has 20 divisors (see below), whose sum is σ = 42747760. Its totient is φ = 9928224.

The previous prime is 20959853. The next prime is 20959889. The reversal of 20959888 is 88895902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20959889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34170 + ... + 34777.

It is an arithmetic number, because the mean of its divisors is an integer number (2137388).

Almost surely, 2^20959888 is an apocalyptic number.

It is an amenable number.

20959888 is an abundant number, since it is smaller than the sum of its proper divisors (21787872).

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

20959888 is a wasteful number, since it uses less digits than its factorization.

20959888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68974 (or 68968 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 49.

The square root of 20959888 is about 4578.1970250307. The cubic root of 20959888 is about 275.7166454123.

The spelling of 20959888 in words is "twenty million, nine hundred fifty-nine thousand, eight hundred eighty-eight".