20881896 has 32 divisors (see below), whose sum is σ = 59663040. Its totient is φ = 5966208.

The previous prime is 20881873. The next prime is 20881897. The reversal of 20881896 is 69818802.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20881897) 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 7 ways as a sum of consecutive naturals, for example, 61981 + ... + 62316.

It is an arithmetic number, because the mean of its divisors is an integer number (1864470).

Almost surely, 2^20881896 is an apocalyptic number.

It is an amenable number.

20881896 is an abundant number, since it is smaller than the sum of its proper divisors (38781144).

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

20881896 is a wasteful number, since it uses less digits than its factorization.

20881896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124313 (or 124309 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 20881896 is about 4569.6713229728. The cubic root of 20881896 is about 275.3742386889.

The spelling of 20881896 in words is "twenty million, eight hundred eighty-one thousand, eight hundred ninety-six".