20162749 has 4 divisors (see below), whose sum is σ = 20171836. Its totient is φ = 20153664.

The previous prime is 20162717. The next prime is 20162761. The reversal of 20162749 is 94726102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94726102 = 2 ⋅47363051.

It can be written as a sum of positive squares in 2 ways, for example, as 19740249 + 422500 = 4443^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 20162749 - 2⁵ = 20162717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20162749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20162449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1237 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (5042959).

Almost surely, 2^20162749 is an apocalyptic number.

It is an amenable number.

20162749 is a deficient number, since it is larger than the sum of its proper divisors (9087).

20162749 is an equidigital number, since it uses as much as digits as its factorization.

20162749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9086.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20162749 is about 4490.2949791745. The cubic root of 20162749 is about 272.1760547434.

The spelling of 20162749 in words is "twenty million, one hundred sixty-two thousand, seven hundred forty-nine".