20412556 has 6 divisors (see below), whose sum is σ = 35721980. Its totient is φ = 10206276.

The previous prime is 20412541. The next prime is 20412559. The reversal of 20412556 is 65521402.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20412556.

It is not an unprimeable number, because it can be changed into a prime (20412559) 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 as a sum of consecutive naturals, namely, 2551566 + ... + 2551573.

Almost surely, 2^20412556 is an apocalyptic number.

It is an amenable number.

20412556 is a deficient number, since it is larger than the sum of its proper divisors (15309424).

20412556 is a wasteful number, since it uses less digits than its factorization.

20412556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103143 (or 5103141 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20412556 is about 4518.0256750045. The cubic root of 20412556 is about 273.2954888447.

Adding to 20412556 its reverse (65521402), we get a palindrome (85933958).

The spelling of 20412556 in words is "twenty million, four hundred twelve thousand, five hundred fifty-six".