20256436 has 12 divisors (see below), whose sum is σ = 36203328. Its totient is φ = 9912632.

The previous prime is 20256433. The next prime is 20256461. The reversal of 20256436 is 63465202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256433) 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, 53686 + ... + 54061.

It is an arithmetic number, because the mean of its divisors is an integer number (3016944).

Almost surely, 2^20256436 is an apocalyptic number.

It is an amenable number.

20256436 is a deficient number, since it is larger than the sum of its proper divisors (15946892).

20256436 is a wasteful number, since it uses less digits than its factorization.

20256436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107798 (or 107796 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20256436 is about 4500.7150542997. The cubic root of 20256436 is about 272.5969623800.

The spelling of 20256436 in words is "twenty million, two hundred fifty-six thousand, four hundred thirty-six".