20256001 has 4 divisors (see below), whose sum is σ = 20267604. Its totient is φ = 20244400.

The previous prime is 20255999. The next prime is 20256029. The reversal of 20256001 is 10065202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17631601 + 2624400 = 4199^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 20256001 - 2¹ = 20255999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20226001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2590 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (5066901).

Almost surely, 2^20256001 is an apocalyptic number.

It is an amenable number.

20256001 is a deficient number, since it is larger than the sum of its proper divisors (11603).

20256001 is an equidigital number, since it uses as much as digits as its factorization.

20256001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11602.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20256001 is about 4500.6667283859. Note that the first 3 decimals coincide. The cubic root of 20256001 is about 272.5950110574.

The spelling of 20256001 in words is "twenty million, two hundred fifty-six thousand, one".