20653601 has 4 divisors (see below), whose sum is σ = 20667312. Its totient is φ = 20639892.

The previous prime is 20653579. The next prime is 20653639. The reversal of 20653601 is 10635602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10635602 = 2 ⋅5317801.

It is a cyclic number.

It is not a de Polignac number, because 20653601 - 2⁶ = 20653537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20653651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271 + ... + 7716.

It is an arithmetic number, because the mean of its divisors is an integer number (5166828).

Almost surely, 2^20653601 is an apocalyptic number.

It is an amenable number.

20653601 is a deficient number, since it is larger than the sum of its proper divisors (13711).

20653601 is a wasteful number, since it uses less digits than its factorization.

20653601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13710.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20653601 is about 4544.6233067219. The cubic root of 20653601 is about 274.3670334772.

The spelling of 20653601 in words is "twenty million, six hundred fifty-three thousand, six hundred one".