20172079 has 2 divisors, whose sum is σ = 20172080. Its totient is φ = 20172078.

The previous prime is 20172073. The next prime is 20172101. The reversal of 20172079 is 97027102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20172079 - 2⁷ = 20171951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20172073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086039 + 10086040.

It is an arithmetic number, because the mean of its divisors is an integer number (10086040).

Almost surely, 2^20172079 is an apocalyptic number.

20172079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20172079 is an equidigital number, since it uses as much as digits as its factorization.

20172079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20172079 is about 4491.3337662659. Note that the first 3 decimals coincide. The cubic root of 20172079 is about 272.2180300217.

It can be divided in two parts, 2017 and 2079, that added together give a 12-th power (4096 = 2¹²).

The spelling of 20172079 in words is "twenty million, one hundred seventy-two thousand, seventy-nine".