20232556 has 6 divisors (see below), whose sum is σ = 35406980. Its totient is φ = 10116276.

The previous prime is 20232547. The next prime is 20232559. The reversal of 20232556 is 65523202.

It is a self number, because there is not a number n which added to its sum of digits gives 20232556.

It is not an unprimeable number, because it can be changed into a prime (20232559) 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, 2529066 + ... + 2529073.

Almost surely, 2^20232556 is an apocalyptic number.

It is an amenable number.

20232556 is a deficient number, since it is larger than the sum of its proper divisors (15174424).

20232556 is a wasteful number, since it uses less digits than its factorization.

20232556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5058143 (or 5058141 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20232556 is about 4498.0613601862. The cubic root of 20232556 is about 272.4898001401.

Adding to 20232556 its reverse (65523202), we get a palindrome (85755758).

The spelling of 20232556 in words is "twenty million, two hundred thirty-two thousand, five hundred fifty-six".