20256423 has 16 divisors (see below), whose sum is σ = 30415872. Its totient is φ = 11880000.

The previous prime is 20256407. The next prime is 20256433. The reversal of 20256423 is 32465202.

It is not a de Polignac number, because 20256423 - 2⁴ = 20256407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20256393 and 20256402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256403) 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 15 ways as a sum of consecutive naturals, for example, 8878 + ... + 10923.

It is an arithmetic number, because the mean of its divisors is an integer number (1900992).

Almost surely, 2^20256423 is an apocalyptic number.

20256423 is a deficient number, since it is larger than the sum of its proper divisors (10159449).

20256423 is a wasteful number, since it uses less digits than its factorization.

20256423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19846.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20256423 is about 4500.7136100845. The cubic root of 20256423 is about 272.5969040650.

It can be divided in two parts, 2025 and 6423, that added together give a palindrome (8448).

The spelling of 20256423 in words is "twenty million, two hundred fifty-six thousand, four hundred twenty-three".