20355253401644 has 24 divisors (see below), whose sum is σ = 40716788682528. Its totient is φ = 8722333912320.

The previous prime is 20355253401617. The next prime is 20355253401697. The reversal of 20355253401644 is 44610435255302.

It is a junction number, because it is equal to n+sod(n) for n = 20355253401595 and 20355253401604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55903499 + ... + 56266434.

It is an arithmetic number, because the mean of its divisors is an integer number (1696532861772).

Almost surely, 2^{20355253401644} is an apocalyptic number.

It is an amenable number.

20355253401644 is an abundant number, since it is smaller than the sum of its proper divisors (20361535280884).

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

20355253401644 is a wasteful number, since it uses less digits than its factorization.

20355253401644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112176425 (or 112176423 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 44.

Adding to 20355253401644 its reverse (44610435255302), we get a palindrome (64965688656946).

The spelling of 20355253401644 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred one thousand, six hundred forty-four".