20256518 has 8 divisors (see below), whose sum is σ = 30415080. Its totient is φ = 10118160.

The previous prime is 20256497. The next prime is 20256521. The reversal of 20256518 is 81565202.

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

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, 2228 + ... + 6743.

It is an arithmetic number, because the mean of its divisors is an integer number (3801885).

Almost surely, 2^20256518 is an apocalyptic number.

20256518 is a deficient number, since it is larger than the sum of its proper divisors (10158562).

20256518 is a wasteful number, since it uses less digits than its factorization.

20256518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 20256518 is about 4500.7241639541. The cubic root of 20256518 is about 272.5973302124.

The spelling of 20256518 in words is "twenty million, two hundred fifty-six thousand, five hundred eighteen".