20855429 has 16 divisors (see below), whose sum is σ = 24931200. Its totient is φ = 17428320.

The previous prime is 20855423. The next prime is 20855453. The reversal of 20855429 is 92455802.

It is a happy number.

It is not a de Polignac number, because 20855429 - 2²⁴ = 4078213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855423) 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 15 ways as a sum of consecutive naturals, for example, 13322 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (1558200).

Almost surely, 2^20855429 is an apocalyptic number.

It is an amenable number.

20855429 is a deficient number, since it is larger than the sum of its proper divisors (4075771).

20855429 is an equidigital number, since it uses as much as digits as its factorization.

20855429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 20855429 is about 4566.7744634479. The cubic root of 20855429 is about 275.2578474159.

The spelling of 20855429 in words is "twenty million, eight hundred fifty-five thousand, four hundred twenty-nine".