20956144 has 20 divisors (see below), whose sum is σ = 44294040. Its totient is φ = 9525440.

The previous prime is 20956139. The next prime is 20956153. The reversal of 20956144 is 44165902.

It is a congruent number.

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, 59359 + ... + 59710.

It is an arithmetic number, because the mean of its divisors is an integer number (2214702).

Almost surely, 2^20956144 is an apocalyptic number.

It is an amenable number.

20956144 is an abundant number, since it is smaller than the sum of its proper divisors (23337896).

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

20956144 is a wasteful number, since it uses less digits than its factorization.

20956144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119088 (or 119082 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20956144 is about 4577.7881121782. The cubic root of 20956144 is about 275.7002276307.

The spelling of 20956144 in words is "twenty million, nine hundred fifty-six thousand, one hundred forty-four".