20105124270515 has 4 divisors (see below), whose sum is σ = 24126149124624. Its totient is φ = 16084099416408.

The previous prime is 20105124270499. The next prime is 20105124270523. The reversal of 20105124270515 is 51507242150102.

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

It is a cyclic number.

It is not a de Polignac number, because 20105124270515 - 2⁴ = 20105124270499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010512427047 + ... + 2010512427056.

It is an arithmetic number, because the mean of its divisors is an integer number (6031537281156).

Almost surely, 2^{20105124270515} is an apocalyptic number.

20105124270515 is a deficient number, since it is larger than the sum of its proper divisors (4021024854109).

20105124270515 is an equidigital number, since it uses as much as digits as its factorization.

20105124270515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4021024854108.

The product of its (nonzero) digits is 28000, while the sum is 35.

The spelling of 20105124270515 in words is "twenty trillion, one hundred five billion, one hundred twenty-four million, two hundred seventy thousand, five hundred fifteen".