20540456 has 8 divisors (see below), whose sum is σ = 38513370. Its totient is φ = 10270224.

The previous prime is 20540453. The next prime is 20540459. The reversal of 20540456 is 65404502.

It is an interprime number because it is at equal distance from previous prime (20540453) and next prime (20540459).

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 9424900 = 3334^2 + 3070^2 .

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 (20540453) 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 as a sum of consecutive naturals, namely, 1283771 + ... + 1283786.

Almost surely, 2^20540456 is an apocalyptic number.

It is an amenable number.

20540456 is a deficient number, since it is larger than the sum of its proper divisors (17972914).

20540456 is a wasteful number, since it uses less digits than its factorization.

20540456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567563 (or 2567559 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20540456 is about 4532.1579848898. The cubic root of 20540456 is about 273.8651013373.

Adding to 20540456 its reverse (65404502), we get a palindrome (85944958).

The spelling of 20540456 in words is "twenty million, five hundred forty thousand, four hundred fifty-six".