20854129 has 4 divisors (see below), whose sum is σ = 21139876. Its totient is φ = 20568384.

The previous prime is 20854111. The next prime is 20854139. The reversal of 20854129 is 92145802.

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 15800625 + 5053504 = 3975^2 + 2248^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20854129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20854129.

It is not an unprimeable number, because it can be changed into a prime (20854109) 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, 142764 + ... + 142909.

It is an arithmetic number, because the mean of its divisors is an integer number (5284969).

Almost surely, 2^20854129 is an apocalyptic number.

It is an amenable number.

20854129 is a deficient number, since it is larger than the sum of its proper divisors (285747).

20854129 is an equidigital number, since it uses as much as digits as its factorization.

20854129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285746.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 20854129 is about 4566.6321288232. The cubic root of 20854129 is about 275.2521279997.

The spelling of 20854129 in words is "twenty million, eight hundred fifty-four thousand, one hundred twenty-nine".