20152111 has 4 divisors (see below), whose sum is σ = 23030992. Its totient is φ = 17273232.

The previous prime is 20152073. The next prime is 20152127. The reversal of 20152111 is 11125102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11125102 = 2 ⋅5562551.

It is a cyclic number.

It is not a de Polignac number, because 20152111 - 2⁷ = 20151983 is a prime.

It is a super-2 number, since 2×20152111² = 812215155512642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20152091 and 20152100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20152211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439430 + ... + 1439443.

It is an arithmetic number, because the mean of its divisors is an integer number (5757748).

Almost surely, 2^20152111 is an apocalyptic number.

20152111 is a deficient number, since it is larger than the sum of its proper divisors (2878881).

20152111 is an equidigital number, since it uses as much as digits as its factorization.

20152111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878880.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 20152111 is about 4489.1102681935. The cubic root of 20152111 is about 272.1281790258.

Adding to 20152111 its reverse (11125102), we get a palindrome (31277213).

The spelling of 20152111 in words is "twenty million, one hundred fifty-two thousand, one hundred eleven".