20728461059 has 4 divisors (see below), whose sum is σ = 20743029216. Its totient is φ = 20713892904.

The previous prime is 20728461043. The next prime is 20728461077. The reversal of 20728461059 is 95016482702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20728461059 - 2⁴ = 20728461043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20728461359) 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, 7281944 + ... + 7284789.

It is an arithmetic number, because the mean of its divisors is an integer number (5185757304).

Almost surely, 2^20728461059 is an apocalyptic number.

20728461059 is a deficient number, since it is larger than the sum of its proper divisors (14568157).

20728461059 is a wasteful number, since it uses less digits than its factorization.

20728461059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14568156.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 20728461059 in words is "twenty billion, seven hundred twenty-eight million, four hundred sixty-one thousand, fifty-nine".