20215263 has 8 divisors (see below), whose sum is σ = 26979376. Its totient is φ = 13464000.

The previous prime is 20215241. The next prime is 20215267. The reversal of 20215263 is 36251202.

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

It is not a de Polignac number, because 20215263 - 2¹² = 20211167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1413 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (3372422).

Almost surely, 2^20215263 is an apocalyptic number.

20215263 is a deficient number, since it is larger than the sum of its proper divisors (6764113).

20215263 is a wasteful number, since it uses less digits than its factorization.

20215263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6425.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20215263 is about 4496.1386766869. The cubic root of 20215263 is about 272.4121446152.

Adding to 20215263 its reverse (36251202), we get a palindrome (56466465).

The spelling of 20215263 in words is "twenty million, two hundred fifteen thousand, two hundred sixty-three".