20791079 has 4 divisors (see below), whose sum is σ = 20856984. Its totient is φ = 20725176.

The previous prime is 20791037. The next prime is 20791081. The reversal of 20791079 is 97019702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20791079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791019) 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, 32477 + ... + 33110.

It is an arithmetic number, because the mean of its divisors is an integer number (5214246).

Almost surely, 2^20791079 is an apocalyptic number.

20791079 is a deficient number, since it is larger than the sum of its proper divisors (65905).

20791079 is an equidigital number, since it uses as much as digits as its factorization.

20791079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65904.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 20791079 is about 4559.7235661825. The cubic root of 20791079 is about 274.9744505189.

The spelling of 20791079 in words is "twenty million, seven hundred ninety-one thousand, seventy-nine".