20575156247 has 4 divisors (see below), whose sum is σ = 20694087960. Its totient is φ = 20456224536.

The previous prime is 20575156213. The next prime is 20575156313. The reversal of 20575156247 is 74265157502.

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 20575156247 - 2¹² = 20575152151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20575156198 and 20575156207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20575159247) 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, 59465597 + ... + 59465942.

It is an arithmetic number, because the mean of its divisors is an integer number (5173521990).

Almost surely, 2^20575156247 is an apocalyptic number.

20575156247 is a deficient number, since it is larger than the sum of its proper divisors (118931713).

20575156247 is a wasteful number, since it uses less digits than its factorization.

20575156247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118931712.

The product of its (nonzero) digits is 588000, while the sum is 44.

The spelling of 20575156247 in words is "twenty billion, five hundred seventy-five million, one hundred fifty-six thousand, two hundred forty-seven".