20215413 has 24 divisors (see below), whose sum is σ = 31606848. Its totient is φ = 12887424.

The previous prime is 20215381. The next prime is 20215417. The reversal of 20215413 is 31451202.

It is not a de Polignac number, because 20215413 - 2⁵ = 20215381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3781 + ... + 7397.

It is an arithmetic number, because the mean of its divisors is an integer number (1316952).

Almost surely, 2^20215413 is an apocalyptic number.

20215413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20215413 is a deficient number, since it is larger than the sum of its proper divisors (11391435).

20215413 is an equidigital number, since it uses as much as digits as its factorization.

20215413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655 (or 3643 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20215413 is about 4496.1553576361. The cubic root of 20215413 is about 272.4128183919.

Adding to 20215413 its reverse (31451202), we get a palindrome (51666615).

The spelling of 20215413 in words is "twenty million, two hundred fifteen thousand, four hundred thirteen".