20152205 has 4 divisors (see below), whose sum is σ = 24182652. Its totient is φ = 16121760.

The previous prime is 20152199. The next prime is 20152211. The reversal of 20152205 is 50225102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50225102 = 2 ⋅25112551.

It is an interprime number because it is at equal distance from previous prime (20152199) and next prime (20152211).

It can be written as a sum of positive squares in 2 ways, for example, as 2149156 + 18003049 = 1466^2 + 4243^2 .

It is not a de Polignac number, because 20152205 - 2⁸ = 20151949 is a prime.

It is a super-2 number, since 2×20152205² = 812222732724050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015216 + ... + 2015225.

It is an arithmetic number, because the mean of its divisors is an integer number (6045663).

Almost surely, 2^20152205 is an apocalyptic number.

It is an amenable number.

20152205 is a deficient number, since it is larger than the sum of its proper divisors (4030447).

20152205 is an equidigital number, since it uses as much as digits as its factorization.

20152205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030446.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20152205 is about 4489.1207379619. The cubic root of 20152205 is about 272.1286021412.

Adding to 20152205 its reverse (50225102), we get a palindrome (70377307).

The spelling of 20152205 in words is "twenty million, one hundred fifty-two thousand, two hundred five".