20355253401642 has 64 divisors (see below), whose sum is σ = 42174911882880. Its totient is φ = 6544768947200.

The previous prime is 20355253401617. The next prime is 20355253401697. The reversal of 20355253401642 is 24610435255302.

It is a junction number, because it is equal to n+sod(n) for n = 20355253401594 and 20355253401603.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496776268 + ... + 496817240.

It is an arithmetic number, because the mean of its divisors is an integer number (658982998170).

Almost surely, 2^{20355253401642} is an apocalyptic number.

20355253401642 is an abundant number, since it is smaller than the sum of its proper divisors (21819658481238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20355253401642 is a wasteful number, since it uses less digits than its factorization.

20355253401642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63799.

The product of its (nonzero) digits is 864000, while the sum is 42.

Adding to 20355253401642 its reverse (24610435255302), we get a palindrome (44965688656944).

The spelling of 20355253401642 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred one thousand, six hundred forty-two".