20450215 has 8 divisors (see below), whose sum is σ = 24651648. Its totient is φ = 16285920.

The previous prime is 20450207. The next prime is 20450239. The reversal of 20450215 is 51205402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20450215 - 2³ = 20450207 is a prime.

It is a super-2 number, since 2×20450215² = 836422587092450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20450192 and 20450201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8056 + ... + 10285.

It is an arithmetic number, because the mean of its divisors is an integer number (3081456).

Almost surely, 2^20450215 is an apocalyptic number.

20450215 is a deficient number, since it is larger than the sum of its proper divisors (4201433).

20450215 is a wasteful number, since it uses less digits than its factorization.

20450215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18569.

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

The square root of 20450215 is about 4522.1913935613. The cubic root of 20450215 is about 273.4634526551.

Adding to 20450215 its reverse (51205402), we get a palindrome (71655617).

The spelling of 20450215 in words is "twenty million, four hundred fifty thousand, two hundred fifteen".