20461256 has 16 divisors (see below), whose sum is σ = 38413440. Its totient is φ = 10217680.

The previous prime is 20461253. The next prime is 20461279. The reversal of 20461256 is 65216402.

It is not an unprimeable number, because it can be changed into a prime (20461253) by changing a digit.

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, 10001 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (2400840).

Almost surely, 2^20461256 is an apocalyptic number.

It is an amenable number.

20461256 is a deficient number, since it is larger than the sum of its proper divisors (17952184).

20461256 is a wasteful number, since it uses less digits than its factorization.

20461256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244 (or 3240 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20461256 is about 4523.4119865429. The cubic root of 20461256 is about 273.5126577901.

Adding to 20461256 its reverse (65216402), we get a palindrome (85677658).

The spelling of 20461256 in words is "twenty million, four hundred sixty-one thousand, two hundred fifty-six".