20542773517 has 8 divisors (see below), whose sum is σ = 24023443136. Its totient is φ = 17198600832.

The previous prime is 20542773491. The next prime is 20542773521. The reversal of 20542773517 is 71537724502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20542773517 - 2⁷ = 20542773389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542773557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34123908 + ... + 34124509.

It is an arithmetic number, because the mean of its divisors is an integer number (3002930392).

Almost surely, 2^20542773517 is an apocalyptic number.

It is an amenable number.

20542773517 is a deficient number, since it is larger than the sum of its proper divisors (3480669619).

20542773517 is an equidigital number, since it uses as much as digits as its factorization.

20542773517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68248467.

The product of its (nonzero) digits is 411600, while the sum is 43.

The spelling of 20542773517 in words is "twenty billion, five hundred forty-two million, seven hundred seventy-three thousand, five hundred seventeen".