20500456 has 8 divisors (see below), whose sum is σ = 38438370. Its totient is φ = 10250224.

The previous prime is 20500439. The next prime is 20500457. The reversal of 20500456 is 65400502.

It can be written as a sum of positive squares in only one way, i.e., 12716356 + 7784100 = 3566^2 + 2790^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20500457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281271 + ... + 1281286.

Almost surely, 2^20500456 is an apocalyptic number.

It is an amenable number.

20500456 is a deficient number, since it is larger than the sum of its proper divisors (17937914).

20500456 is a wasteful number, since it uses less digits than its factorization.

20500456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562563 (or 2562559 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20500456 is about 4527.7429255646. The cubic root of 20500456 is about 273.6872130004.

Adding to 20500456 its reverse (65400502), we get a palindrome (85900958).

The spelling of 20500456 in words is "twenty million, five hundred thousand, four hundred fifty-six".