20256955 has 8 divisors (see below), whose sum is σ = 24406704. Its totient is φ = 16140000.

The previous prime is 20256949. The next prime is 20256959. The reversal of 20256955 is 55965202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20256955 - 2¹⁹ = 19732667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20256955.

It is not an unprimeable number, because it can be changed into a prime (20256959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6816 + ... + 9325.

It is an arithmetic number, because the mean of its divisors is an integer number (3050838).

Almost surely, 2^20256955 is an apocalyptic number.

20256955 is a deficient number, since it is larger than the sum of its proper divisors (4149749).

20256955 is a wasteful number, since it uses less digits than its factorization.

20256955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16397.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 20256955 is about 4500.7727114352. The cubic root of 20256955 is about 272.5992904733.

The spelling of 20256955 in words is "twenty million, two hundred fifty-six thousand, nine hundred fifty-five".