20824538577 has 4 divisors (see below), whose sum is σ = 27766051440. Its totient is φ = 13883025716.

The previous prime is 20824538557. The next prime is 20824538591. The reversal of 20824538577 is 77583542802.

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.

It is a cyclic number.

It is not a de Polignac number, because 20824538577 - 2¹⁶ = 20824473041 is a prime.

It is a super-2 number, since 2×20824538577² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20824538557) 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, 3470756427 + ... + 3470756432.

It is an arithmetic number, because the mean of its divisors is an integer number (6941512860).

Almost surely, 2^20824538577 is an apocalyptic number.

It is an amenable number.

20824538577 is a deficient number, since it is larger than the sum of its proper divisors (6941512863).

20824538577 is an equidigital number, since it uses as much as digits as its factorization.

20824538577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6941512862.

The product of its (nonzero) digits is 3763200, while the sum is 51.

The spelling of 20824538577 in words is "twenty billion, eight hundred twenty-four million, five hundred thirty-eight thousand, five hundred seventy-seven".