20715514542505 has 8 divisors (see below), whose sum is σ = 24968126780352. Its totient is φ = 16499405414448.

The previous prime is 20715514542487. The next prime is 20715514542511. The reversal of 20715514542505 is 50524541551702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20715514542505 - 2⁹ = 20715514541993 is a prime.

It is a super-2 number, since 2×20715514542505² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9125776197 + ... + 9125778466.

It is an arithmetic number, because the mean of its divisors is an integer number (3121015847544).

Almost surely, 2^{20715514542505} is an apocalyptic number.

It is an amenable number.

20715514542505 is a deficient number, since it is larger than the sum of its proper divisors (4252612237847).

20715514542505 is a wasteful number, since it uses less digits than its factorization.

20715514542505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18251554895.

The product of its (nonzero) digits is 1400000, while the sum is 46.

The spelling of 20715514542505 in words is "twenty trillion, seven hundred fifteen billion, five hundred fourteen million, five hundred forty-two thousand, five hundred five".