20075769457 has 4 divisors (see below), whose sum is σ = 20502913536. Its totient is φ = 19648625380.

The previous prime is 20075769349. The next prime is 20075769481. The reversal of 20075769457 is 75496757002.

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 a de Polignac number, because none of the positive numbers 2^k-20075769457 is a prime.

It is a super-2 number, since 2×20075769457² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20075769487) 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, 213571969 + ... + 213572062.

It is an arithmetic number, because the mean of its divisors is an integer number (5125728384).

Almost surely, 2^20075769457 is an apocalyptic number.

It is an amenable number.

20075769457 is a deficient number, since it is larger than the sum of its proper divisors (427144079).

20075769457 is an equidigital number, since it uses as much as digits as its factorization.

20075769457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427144078.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 20075769457 in words is "twenty billion, seventy-five million, seven hundred sixty-nine thousand, four hundred fifty-seven".