20711574155 has 4 divisors (see below), whose sum is σ = 24853888992. Its totient is φ = 16569259320.

The previous prime is 20711574139. The next prime is 20711574167. The reversal of 20711574155 is 55147511702.

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

It is not a de Polignac number, because 20711574155 - 2⁴ = 20711574139 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, 2071157411 + ... + 2071157420.

It is an arithmetic number, because the mean of its divisors is an integer number (6213472248).

Almost surely, 2^20711574155 is an apocalyptic number.

20711574155 is a deficient number, since it is larger than the sum of its proper divisors (4142314837).

20711574155 is an equidigital number, since it uses as much as digits as its factorization.

20711574155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142314836.

The product of its (nonzero) digits is 49000, while the sum is 38.

The spelling of 20711574155 in words is "twenty billion, seven hundred eleven million, five hundred seventy-four thousand, one hundred fifty-five".