20159656 has 32 divisors (see below), whose sum is σ = 41640480. Its totient is φ = 9073600.

The previous prime is 20159639. The next prime is 20159681. The reversal of 20159656 is 65695102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8346 + ... + 10486.

It is an arithmetic number, because the mean of its divisors is an integer number (1301265).

Almost surely, 2^20159656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20159656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20820240).

20159656 is an abundant number, since it is smaller than the sum of its proper divisors (21480824).

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

20159656 is a wasteful number, since it uses less digits than its factorization.

20159656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265 (or 2261 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 20159656 is about 4489.9505565206. The cubic root of 20159656 is about 272.1621366084.

The spelling of 20159656 in words is "twenty million, one hundred fifty-nine thousand, six hundred fifty-six".