20301649 has 4 divisors (see below), whose sum is σ = 20314420. Its totient is φ = 20288880.

The previous prime is 20301647. The next prime is 20301691. The reversal of 20301649 is 94610302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94610302 = 2 ⋅47305151.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 18861649 = 1200^2 + 4343^2 .

It is a cyclic number.

It is not a de Polignac number, because 20301649 - 2¹ = 20301647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20301647) 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, 3594 + ... + 7315.

It is an arithmetic number, because the mean of its divisors is an integer number (5078605).

Almost surely, 2^20301649 is an apocalyptic number.

It is an amenable number.

20301649 is a deficient number, since it is larger than the sum of its proper divisors (12771).

20301649 is a wasteful number, since it uses less digits than its factorization.

20301649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12770.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20301649 is about 4505.7351231514. The cubic root of 20301649 is about 272.7996266582.

The spelling of 20301649 in words is "twenty million, three hundred one thousand, six hundred forty-nine".