20406552 has 16 divisors (see below), whose sum is σ = 51016440. Its totient is φ = 6802176.

The previous prime is 20406539. The next prime is 20406559. The reversal of 20406552 is 25560402.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 850273 = 20406552 / (2 + 0 + 4 + 0 + 6 + 5 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406559) 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, 425113 + ... + 425160.

Almost surely, 2^20406552 is an apocalyptic number.

It is an amenable number.

20406552 is an abundant number, since it is smaller than the sum of its proper divisors (30609888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20406552 is a wasteful number, since it uses less digits than its factorization.

20406552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850282 (or 850278 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20406552 is about 4517.3611766163. The cubic root of 20406552 is about 273.2686911714.

Adding to 20406552 its reverse (25560402), we get a palindrome (45966954).

The spelling of 20406552 in words is "twenty million, four hundred six thousand, five hundred fifty-two".