20155896 has 48 divisors (see below), whose sum is σ = 54843360. Its totient is φ = 6687360.

The previous prime is 20155867. The next prime is 20155909. The reversal of 20155896 is 69855102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20155896.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18996 + ... + 20028.

It is an arithmetic number, because the mean of its divisors is an integer number (1142570).

Almost surely, 2^20155896 is an apocalyptic number.

It is an amenable number.

20155896 is an abundant number, since it is smaller than the sum of its proper divisors (34687464).

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

20155896 is a wasteful number, since it uses less digits than its factorization.

20155896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 20155896 is about 4489.5318241438. The cubic root of 20155896 is about 272.1452151348.

The spelling of 20155896 in words is "twenty million, one hundred fifty-five thousand, eight hundred ninety-six".