20472711577 has 4 divisors (see below), whose sum is σ = 20473724160. Its totient is φ = 20471698996.

The previous prime is 20472711547. The next prime is 20472711583. The reversal of 20472711577 is 77511727402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77511727402 = 2 ⋅38755863701.

It is a cyclic number.

It is not a de Polignac number, because 20472711577 - 2⁷ = 20472711449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20472711547) 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, 475333 + ... + 516610.

It is an arithmetic number, because the mean of its divisors is an integer number (5118431040).

Almost surely, 2^20472711577 is an apocalyptic number.

It is an amenable number.

20472711577 is a deficient number, since it is larger than the sum of its proper divisors (1012583).

20472711577 is an equidigital number, since it uses as much as digits as its factorization.

20472711577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012582.

The product of its (nonzero) digits is 192080, while the sum is 43.

The spelling of 20472711577 in words is "twenty billion, four hundred seventy-two million, seven hundred eleven thousand, five hundred seventy-seven".