20189956 has 12 divisors (see below), whose sum is σ = 35412300. Its totient is φ = 10072160.

The previous prime is 20189941. The next prime is 20189969. The reversal of 20189956 is 65998102.

It can be written as a sum of positive squares in 2 ways, for example, as 3297856 + 16892100 = 1816^2 + 4110^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3631 + ... + 7318.

It is an arithmetic number, because the mean of its divisors is an integer number (2951025).

Almost surely, 2^20189956 is an apocalyptic number.

It is an amenable number.

20189956 is a deficient number, since it is larger than the sum of its proper divisors (15222344).

20189956 is a wasteful number, since it uses less digits than its factorization.

20189956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414 (or 11412 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20189956 is about 4493.3234915817. The cubic root of 20189956 is about 272.2984217493.

The spelling of 20189956 in words is "twenty million, one hundred eighty-nine thousand, nine hundred fifty-six".