20215013 has 16 divisors (see below), whose sum is σ = 25030656. Its totient is φ = 15897600.

The previous prime is 20214991. The next prime is 20215021. The reversal of 20215013 is 31051202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20215013 - 2¹⁶ = 20149477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215033) 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 15 ways as a sum of consecutive naturals, for example, 16988 + ... + 18138.

It is an arithmetic number, because the mean of its divisors is an integer number (1564416).

Almost surely, 2^20215013 is an apocalyptic number.

It is an amenable number.

20215013 is a deficient number, since it is larger than the sum of its proper divisors (4815643).

20215013 is a wasteful number, since it uses less digits than its factorization.

20215013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20215013 is about 4496.1108749674. The cubic root of 20215013 is about 272.4110216466.

Adding to 20215013 its reverse (31051202), we get a palindrome (51266215).

The spelling of 20215013 in words is "twenty million, two hundred fifteen thousand, thirteen".