20342021 has 8 divisors (see below), whose sum is σ = 24049920. Its totient is φ = 16834608.

The previous prime is 20342011. The next prime is 20342029. The reversal of 20342021 is 12024302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20342021 - 2⁶ = 20341957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20341987 and 20342005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342029) 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 7 ways as a sum of consecutive naturals, for example, 49901 + ... + 50306.

It is an arithmetic number, because the mean of its divisors is an integer number (3006240).

Almost surely, 2^20342021 is an apocalyptic number.

It is an amenable number.

20342021 is a deficient number, since it is larger than the sum of its proper divisors (3707899).

20342021 is a wasteful number, since it uses less digits than its factorization.

20342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100243.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20342021 is about 4510.2129661469. The cubic root of 20342021 is about 272.9803373334.

Adding to 20342021 its reverse (12024302), we get a palindrome (32366323).

It can be divided in two parts, 203 and 42021, that added together give a palindrome (42224).

The spelling of 20342021 in words is "twenty million, three hundred forty-two thousand, twenty-one".