20162311 has 4 divisors (see below), whose sum is σ = 21713272. Its totient is φ = 18611352.

The previous prime is 20162309. The next prime is 20162321. The reversal of 20162311 is 11326102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11326102 = 2 ⋅5663051.

It is a cyclic number.

It is not a de Polignac number, because 20162311 - 2¹ = 20162309 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 (20162321) 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 3 ways as a sum of consecutive naturals, for example, 775461 + ... + 775486.

It is an arithmetic number, because the mean of its divisors is an integer number (5428318).

Almost surely, 2^20162311 is an apocalyptic number.

20162311 is a deficient number, since it is larger than the sum of its proper divisors (1550961).

20162311 is a wasteful number, since it uses less digits than its factorization.

20162311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550960.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20162311 is about 4490.2462070581. The cubic root of 20162311 is about 272.1740838816.

Adding to 20162311 its reverse (11326102), we get a palindrome (31488413).

The spelling of 20162311 in words is "twenty million, one hundred sixty-two thousand, three hundred eleven".