20215450 has 12 divisors (see below), whose sum is σ = 37600830. Its totient is φ = 8086160.

The previous prime is 20215417. The next prime is 20215451. The reversal of 20215450 is 5451202.

It can be written as a sum of positive squares in 3 ways, for example, as 14295961 + 5919489 = 3781^2 + 2433^2 .

It is not an unprimeable number, because it can be changed into a prime (20215451) 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 in 5 ways as a sum of consecutive naturals, for example, 202105 + ... + 202204.

Almost surely, 2^20215450 is an apocalyptic number.

20215450 is a deficient number, since it is larger than the sum of its proper divisors (17385380).

20215450 is a wasteful number, since it uses less digits than its factorization.

20215450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404321 (or 404316 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20215450 is about 4496.1594722607. The cubic root of 20215450 is about 272.4129845897.

Adding to 20215450 its reverse (5451202), we get a palindrome (25666652).

The spelling of 20215450 in words is "twenty million, two hundred fifteen thousand, four hundred fifty".