20155079 has 4 divisors (see below), whose sum is σ = 23034384. Its totient is φ = 17275776.

The previous prime is 20155073. The next prime is 20155097. The reversal of 20155079 is 97055102.

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

It is not a de Polignac number, because 20155079 - 2¹² = 20150983 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 (20155073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439642 + ... + 1439655.

It is an arithmetic number, because the mean of its divisors is an integer number (5758596).

Almost surely, 2^20155079 is an apocalyptic number.

20155079 is a deficient number, since it is larger than the sum of its proper divisors (2879305).

20155079 is an equidigital number, since it uses as much as digits as its factorization.

20155079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879304.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20155079 is about 4489.4408337787. The cubic root of 20155079 is about 272.1415380363.

The spelling of 20155079 in words is "twenty million, one hundred fifty-five thousand, seventy-nine".