20792129 has 4 divisors (see below), whose sum is σ = 20838084. Its totient is φ = 20746176.

The previous prime is 20792119. The next prime is 20792143. The reversal of 20792129 is 92129702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10857025 + 9935104 = 3295^2 + 3152^2 .

It is a cyclic number.

It is not a de Polignac number, because 20792129 - 2⁸ = 20791873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20792095 and 20792104.

It is not an unprimeable number, because it can be changed into a prime (20792119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22292 + ... + 23205.

It is an arithmetic number, because the mean of its divisors is an integer number (5209521).

Almost surely, 2^20792129 is an apocalyptic number.

It is an amenable number.

20792129 is a deficient number, since it is larger than the sum of its proper divisors (45955).

20792129 is an equidigital number, since it uses as much as digits as its factorization.

20792129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45954.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20792129 is about 4559.8387032877. The cubic root of 20792129 is about 274.9790794002.

The spelling of 20792129 in words is "twenty million, seven hundred ninety-two thousand, one hundred twenty-nine".