20748169 has 4 divisors (see below), whose sum is σ = 22344196. Its totient is φ = 19152144.

The previous prime is 20748163. The next prime is 20748179. The reversal of 20748169 is 96184702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96184702 = 2 ⋅48092351.

It can be written as a sum of positive squares in 2 ways, for example, as 3108169 + 17640000 = 1763^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 20748169 - 2¹⁹ = 20223881 is a prime.

It is a super-2 number, since 2×20748169² = 860973033705122, which contains 22 as substring.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 20748 and 169 contains 20748169 itself.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748163) 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, 797994 + ... + 798019.

It is an arithmetic number, because the mean of its divisors is an integer number (5586049).

Almost surely, 2^20748169 is an apocalyptic number.

It is an amenable number.

20748169 is a deficient number, since it is larger than the sum of its proper divisors (1596027).

20748169 is a wasteful number, since it uses less digits than its factorization.

20748169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596026.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20748169 is about 4555.0158067783. The cubic root of 20748169 is about 274.7851500938.

The spelling of 20748169 in words is "twenty million, seven hundred forty-eight thousand, one hundred sixty-nine".