20247256 has 8 divisors (see below), whose sum is σ = 37963620. Its totient is φ = 10123624.

The previous prime is 20247239. The next prime is 20247257. The reversal of 20247256 is 65274202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247257) 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 as a sum of consecutive naturals, namely, 1265446 + ... + 1265461.

Almost surely, 2^20247256 is an apocalyptic number.

It is an amenable number.

20247256 is a deficient number, since it is larger than the sum of its proper divisors (17716364).

20247256 is a wasteful number, since it uses less digits than its factorization.

20247256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530913 (or 2530909 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20247256 is about 4499.6951007818. The cubic root of 20247256 is about 272.5557768158. Note that the first 3 decimals are identical.

It can be divided in two parts, 20247 and 256, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 20247256 in words is "twenty million, two hundred forty-seven thousand, two hundred fifty-six".