20575733761 has 4 divisors (see below), whose sum is σ = 22446255024. Its totient is φ = 18705212500.

The previous prime is 20575733741. The next prime is 20575733779. The reversal of 20575733761 is 16733757502.

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-20575733761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20575733741) 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, 935260615 + ... + 935260636.

It is an arithmetic number, because the mean of its divisors is an integer number (5611563756).

Almost surely, 2^20575733761 is an apocalyptic number.

It is an amenable number.

20575733761 is a deficient number, since it is larger than the sum of its proper divisors (1870521263).

20575733761 is a wasteful number, since it uses less digits than its factorization.

20575733761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870521262.

The product of its (nonzero) digits is 926100, while the sum is 46.

The spelling of 20575733761 in words is "twenty billion, five hundred seventy-five million, seven hundred thirty-three thousand, seven hundred sixty-one".