20467128729599 has 4 divisors (see below), whose sum is σ = 20509155688464. Its totient is φ = 20425101770736.

The previous prime is 20467128729529. The next prime is 20467128729629. The reversal of 20467128729599 is 99592782176402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20467128729599 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20467128729529) 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, 21013478702 + ... + 21013479675.

It is an arithmetic number, because the mean of its divisors is an integer number (5127288922116).

Almost surely, 2^{20467128729599} is an apocalyptic number.

20467128729599 is a deficient number, since it is larger than the sum of its proper divisors (42026958865).

20467128729599 is an equidigital number, since it uses as much as digits as its factorization.

20467128729599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42026958864.

The product of its (nonzero) digits is 274337280, while the sum is 71.

The spelling of 20467128729599 in words is "twenty trillion, four hundred sixty-seven billion, one hundred twenty-eight million, seven hundred twenty-nine thousand, five hundred ninety-nine".