20635645343 has 8 divisors (see below), whose sum is σ = 22251531120. Its totient is φ = 19072739520.

The previous prime is 20635645321. The next prime is 20635645361. The reversal of 20635645343 is 34354653602.

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 20635645343 - 2⁸ = 20635645087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

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 20635645343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20635645363) 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, 13244180 + ... + 13245737.

It is an arithmetic number, because the mean of its divisors is an integer number (2781441390).

Almost surely, 2^20635645343 is an apocalyptic number.

20635645343 is a deficient number, since it is larger than the sum of its proper divisors (1615885777).

20635645343 is a wasteful number, since it uses less digits than its factorization.

20635645343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26489977.

The product of its (nonzero) digits is 777600, while the sum is 41.

The spelling of 20635645343 in words is "twenty billion, six hundred thirty-five million, six hundred forty-five thousand, three hundred forty-three".