20256897 has 8 divisors (see below), whose sum is σ = 27334944. Its totient is φ = 13341728.

The previous prime is 20256889. The next prime is 20256931. The reversal of 20256897 is 79865202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20256897 - 2³ = 20256889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20256497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40428 + ... + 40925.

It is an arithmetic number, because the mean of its divisors is an integer number (3416868).

Almost surely, 2^20256897 is an apocalyptic number.

It is an amenable number.

20256897 is a deficient number, since it is larger than the sum of its proper divisors (7078047).

20256897 is an equidigital number, since it uses as much as digits as its factorization.

20256897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81439.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 20256897 is about 4500.7662680926. The cubic root of 20256897 is about 272.5990303030.

The spelling of 20256897 in words is "twenty million, two hundred fifty-six thousand, eight hundred ninety-seven".