20551255251305 has 16 divisors (see below), whose sum is σ = 25245368337024. Its totient is φ = 16052076136320.

The previous prime is 20551255251301. The next prime is 20551255251311. The reversal of 20551255251305 is 50315255215502.

It is not a de Polignac number, because 20551255251305 - 2² = 20551255251301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551255251301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19054709 + ... + 20104338.

It is an arithmetic number, because the mean of its divisors is an integer number (1577835521064).

Almost surely, 2^{20551255251305} is an apocalyptic number.

It is an amenable number.

20551255251305 is a deficient number, since it is larger than the sum of its proper divisors (4694113085719).

20551255251305 is a wasteful number, since it uses less digits than its factorization.

20551255251305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39161536.

The product of its (nonzero) digits is 375000, while the sum is 41.

The spelling of 20551255251305 in words is "twenty trillion, five hundred fifty-one billion, two hundred fifty-five million, two hundred fifty-one thousand, three hundred five".