20415550 has 12 divisors (see below), whose sum is σ = 37973016. Its totient is φ = 8166200.

The previous prime is 20415529. The next prime is 20415599. The reversal of 20415550 is 5551402.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 204106 + ... + 204205.

It is an arithmetic number, because the mean of its divisors is an integer number (3164418).

Almost surely, 2^20415550 is an apocalyptic number.

20415550 is a deficient number, since it is larger than the sum of its proper divisors (17557466).

20415550 is a wasteful number, since it uses less digits than its factorization.

20415550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408323 (or 408318 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 20415550 is about 4518.3570022742. The cubic root of 20415550 is about 273.3088500114.

Adding to 20415550 its reverse (5551402), we get a palindrome (25966952).

The spelling of 20415550 in words is "twenty million, four hundred fifteen thousand, five hundred fifty".