20345653 has 8 divisors (see below), whose sum is σ = 20648600. Its totient is φ = 20044800.

The previous prime is 20345629. The next prime is 20345659. The reversal of 20345653 is 35654302.

It can be written as a sum of positive squares in 4 ways, for example, as 7969329 + 12376324 = 2823^2 + 3518^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20345653 - 2⁵ = 20345621 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 (20345659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33553 + ... + 34153.

It is an arithmetic number, because the mean of its divisors is an integer number (2581075).

Almost surely, 2^20345653 is an apocalyptic number.

It is an amenable number.

20345653 is a deficient number, since it is larger than the sum of its proper divisors (302947).

20345653 is an equidigital number, since it uses as much as digits as its factorization.

20345653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047.

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 20345653 is about 4510.6155899167. The cubic root of 20345653 is about 272.9965829428.

Adding to 20345653 its reverse (35654302), we get a palindrome (55999955).

The spelling of 20345653 in words is "twenty million, three hundred forty-five thousand, six hundred fifty-three".