20213215 has 16 divisors (see below), whose sum is σ = 26593920. Its totient is φ = 14626720.

The previous prime is 20213197. The next prime is 20213233. The reversal of 20213215 is 51231202.

It is an interprime number because it is at equal distance from previous prime (20213197) and next prime (20213233).

It is not a de Polignac number, because 20213215 - 2⁵ = 20213183 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11676 + ... + 13294.

It is an arithmetic number, because the mean of its divisors is an integer number (1662120).

Almost surely, 2^20213215 is an apocalyptic number.

20213215 is a deficient number, since it is larger than the sum of its proper divisors (6380705).

20213215 is a wasteful number, since it uses less digits than its factorization.

20213215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20213215 is about 4495.9109199360. The cubic root of 20213215 is about 272.4029449837.

Adding to 20213215 its reverse (51231202), we get a palindrome (71444417).

The spelling of 20213215 in words is "twenty million, two hundred thirteen thousand, two hundred fifteen".