20355120630612 has 18 divisors (see below), whose sum is σ = 51453221594138. Its totient is φ = 6785040210192.

The previous prime is 20355120630599. The next prime is 20355120630617. The reversal of 20355120630612 is 21603602155302.

20355120630612 is a `hidden beast` number, since 2 + 0 + 3 + 5 + 5 + 1 + 2 + 0 + 6 + 30 + 612 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18232609641156 + 2122510989456 = 4269966^2 + 1456884^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 565420017517 = 20355120630612 / (2 + 0 + 3 + 5 + 5 + 1 + 2 + 0 + 6 + 3 + 0 + 6 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355120630617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282710008723 + ... + 282710008794.

Almost surely, 2^{20355120630612} is an apocalyptic number.

It is an amenable number.

20355120630612 is an abundant number, since it is smaller than the sum of its proper divisors (31098100963526).

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

20355120630612 is a wasteful number, since it uses less digits than its factorization.

20355120630612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565420017527 (or 565420017522 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 20355120630612 its reverse (21603602155302), we get a palindrome (41958722785914).

The spelling of 20355120630612 in words is "twenty trillion, three hundred fifty-five billion, one hundred twenty million, six hundred thirty thousand, six hundred twelve".