20461561206554 has 48 divisors (see below), whose sum is σ = 33272912352672. Its totient is φ = 9433001882304.

The previous prime is 20461561206533. The next prime is 20461561206557. The reversal of 20461561206554 is 45560216516402.

It is a junction number, because it is equal to n+sod(n) for n = 20461561206499 and 20461561206508.

It is not an unprimeable number, because it can be changed into a prime (20461561206557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2290554272 + ... + 2290563204.

It is an arithmetic number, because the mean of its divisors is an integer number (693185674014).

Almost surely, 2^{20461561206554} is an apocalyptic number.

20461561206554 is a deficient number, since it is larger than the sum of its proper divisors (12811351146118).

20461561206554 is a wasteful number, since it uses less digits than its factorization.

20461561206554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15951 (or 15938 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 20461561206554 in words is "twenty trillion, four hundred sixty-one billion, five hundred sixty-one million, two hundred six thousand, five hundred fifty-four".