20189856 has 48 divisors (see below), whose sum is σ = 55792800. Its totient is φ = 6375168.

The previous prime is 20189849. The next prime is 20189857. The reversal of 20189856 is 65898102.

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

It is not an unprimeable number, because it can be changed into a prime (20189857) 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, 3711 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (1162350).

Almost surely, 2^20189856 is an apocalyptic number.

It is an amenable number.

20189856 is an abundant number, since it is smaller than the sum of its proper divisors (35602944).

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

20189856 is a wasteful number, since it uses less digits than its factorization.

20189856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101 (or 11093 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20189856 is about 4493.3123639471. The cubic root of 20189856 is about 272.2979721877.

The spelling of 20189856 in words is "twenty million, one hundred eighty-nine thousand, eight hundred fifty-six".