20427635215077 has 32 divisors (see below), whose sum is σ = 28793864724480. Its totient is φ = 12860864802240.

The previous prime is 20427635215073. The next prime is 20427635215087. The reversal of 20427635215077 is 77051253672402.

It is not a de Polignac number, because 20427635215077 - 2² = 20427635215073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427635215073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4833828 + ... + 8013810.

It is an arithmetic number, because the mean of its divisors is an integer number (899808272640).

Almost surely, 2^{20427635215077} is an apocalyptic number.

It is an amenable number.

20427635215077 is a deficient number, since it is larger than the sum of its proper divisors (8366229509403).

20427635215077 is a wasteful number, since it uses less digits than its factorization.

20427635215077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3181633.

The product of its (nonzero) digits is 4939200, while the sum is 51.

Adding to 20427635215077 its reverse (77051253672402), we get a palindrome (97478888887479).

The spelling of 20427635215077 in words is "twenty trillion, four hundred twenty-seven billion, six hundred thirty-five million, two hundred fifteen thousand, seventy-seven".