20352551304561 has 12 divisors (see below), whose sum is σ = 31567222431792. Its totient is φ = 11630029316808.

The previous prime is 20352551304541. The next prime is 20352551304587. The reversal of 20352551304561 is 16540315525302.

It is not a de Polignac number, because 20352551304561 - 2⁷ = 20352551304433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20352551304511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69226364835 + ... + 69226365128.

It is an arithmetic number, because the mean of its divisors is an integer number (2630601869316).

Almost surely, 2^{20352551304561} is an apocalyptic number.

20352551304561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20352551304561 is a deficient number, since it is larger than the sum of its proper divisors (11214671127231).

20352551304561 is a wasteful number, since it uses less digits than its factorization.

20352551304561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138452729980 (or 138452729973 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 20352551304561 its reverse (16540315525302), we get a palindrome (36892866829863).

The spelling of 20352551304561 in words is "twenty trillion, three hundred fifty-two billion, five hundred fifty-one million, three hundred four thousand, five hundred sixty-one".