20355253401643 has 8 divisors (see below), whose sum is σ = 20527218130320. Its totient is φ = 20183539902240.

The previous prime is 20355253401617. The next prime is 20355253401697. The reversal of 20355253401643 is 34610435255302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20355253401643 is a prime.

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 20355253401643.

It is not an unprimeable number, because it can be changed into a prime (20355253404643) 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, 62644588 + ... + 62968681.

It is an arithmetic number, because the mean of its divisors is an integer number (2565902266290).

Almost surely, 2^{20355253401643} is an apocalyptic number.

20355253401643 is a deficient number, since it is larger than the sum of its proper divisors (171964728677).

20355253401643 is a wasteful number, since it uses less digits than its factorization.

20355253401643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125614637.

The product of its (nonzero) digits is 1296000, while the sum is 43.

Adding to 20355253401643 its reverse (34610435255302), we get a palindrome (54965688656945).

The spelling of 20355253401643 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred one thousand, six hundred forty-three".