20355126401633 has 4 divisors (see below), whose sum is σ = 20355210117060. Its totient is φ = 20355042686208.

The previous prime is 20355126401573. The next prime is 20355126401719. The reversal of 20355126401633 is 33610462155302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4009697870929 + 16345428530704 = 2002423^2 + 4042948^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355126401633 - 2³⁶ = 20286406924897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20355126401033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41491928 + ... + 41979641.

It is an arithmetic number, because the mean of its divisors is an integer number (5088802529265).

Almost surely, 2^{20355126401633} is an apocalyptic number.

It is an amenable number.

20355126401633 is a deficient number, since it is larger than the sum of its proper divisors (83715427).

20355126401633 is an equidigital number, since it uses as much as digits as its factorization.

20355126401633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83715426.

The product of its (nonzero) digits is 388800, while the sum is 41.

Adding to 20355126401633 its reverse (33610462155302), we get a palindrome (53965588556935).

The spelling of 20355126401633 in words is "twenty trillion, three hundred fifty-five billion, one hundred twenty-six million, four hundred one thousand, six hundred thirty-three".