20113215 has 16 divisors (see below), whose sum is σ = 32286336. Its totient is φ = 10692000.

The previous prime is 20113213. The next prime is 20113217. The reversal of 20113215 is 51231102.

It is an interprime number because it is at equal distance from previous prime (20113213) and next prime (20113217).

It is not a de Polignac number, because 20113215 - 2¹ = 20113213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 20113194 and 20113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2940 + ... + 6990.

It is an arithmetic number, because the mean of its divisors is an integer number (2017896).

Almost surely, 2^20113215 is an apocalyptic number.

20113215 is a deficient number, since it is larger than the sum of its proper divisors (12173121).

20113215 is a wasteful number, since it uses less digits than its factorization.

20113215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20113215 is about 4484.7759141344. The cubic root of 20113215 is about 271.9529862155.

Adding to 20113215 its reverse (51231102), we get a palindrome (71344317).

The spelling of 20113215 in words is "twenty million, one hundred thirteen thousand, two hundred fifteen".