20955156 has 12 divisors (see below), whose sum is σ = 48895392. Its totient is φ = 6985048.

The previous prime is 20955133. The next prime is 20955167. The reversal of 20955156 is 65155902.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873120 + ... + 873143.

It is an arithmetic number, because the mean of its divisors is an integer number (4074616).

Almost surely, 2^20955156 is an apocalyptic number.

It is an amenable number.

20955156 is an abundant number, since it is smaller than the sum of its proper divisors (27940236).

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

20955156 is a wasteful number, since it uses less digits than its factorization.

20955156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746270 (or 1746268 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 20955156 is about 4577.6801985285. The cubic root of 20955156 is about 275.6958948344.

The spelling of 20955156 in words is "twenty million, nine hundred fifty-five thousand, one hundred fifty-six".