20159956 has 12 divisors (see below), whose sum is σ = 35311360. Its totient is φ = 10071000.

The previous prime is 20159947. The next prime is 20159957. The reversal of 20159956 is 65995102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20159957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7831 + ... + 10081.

Almost surely, 2^20159956 is an apocalyptic number.

It is an amenable number.

20159956 is a deficient number, since it is larger than the sum of its proper divisors (15151404).

20159956 is a wasteful number, since it uses less digits than its factorization.

20159956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494 (or 4492 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 20159956 is about 4489.9839643366. The cubic root of 20159956 is about 272.1634866353.

It can be divided in two parts, 20159 and 956, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20159956 in words is "twenty million, one hundred fifty-nine thousand, nine hundred fifty-six".