20135486517 has 4 divisors (see below), whose sum is σ = 26847315360. Its totient is φ = 13423657676.

The previous prime is 20135486411. The next prime is 20135486537. The reversal of 20135486517 is 71568453102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20135486517 - 2¹⁵ = 20135453749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135486537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3355914417 + ... + 3355914422.

It is an arithmetic number, because the mean of its divisors is an integer number (6711828840).

Almost surely, 2^20135486517 is an apocalyptic number.

It is an amenable number.

20135486517 is a deficient number, since it is larger than the sum of its proper divisors (6711828843).

20135486517 is an equidigital number, since it uses as much as digits as its factorization.

20135486517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711828842.

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 20135486517 in words is "twenty billion, one hundred thirty-five million, four hundred eighty-six thousand, five hundred seventeen".