20634374055557 has 16 divisors (see below), whose sum is σ = 21039401194560. Its totient is φ = 20229931767552.

The previous prime is 20634374055553. The next prime is 20634374055571. The reversal of 20634374055557 is 75555047343602.

It is a cyclic number.

It is not a de Polignac number, because 20634374055557 - 2² = 20634374055553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634374055553) 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, 1305717218 + ... + 1305733020.

It is an arithmetic number, because the mean of its divisors is an integer number (1314962574660).

Almost surely, 2^{20634374055557} is an apocalyptic number.

It is an amenable number.

20634374055557 is a deficient number, since it is larger than the sum of its proper divisors (405027139003).

20634374055557 is a wasteful number, since it uses less digits than its factorization.

20634374055557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32692.

The product of its (nonzero) digits is 52920000, while the sum is 56.

The spelling of 20634374055557 in words is "twenty trillion, six hundred thirty-four billion, three hundred seventy-four million, fifty-five thousand, five hundred fifty-seven".