20344421 has 16 divisors (see below), whose sum is σ = 22161600. Its totient is φ = 18615168.

The previous prime is 20344417. The next prime is 20344433. The reversal of 20344421 is 12444302.

It is a cyclic number.

It is not a de Polignac number, because 20344421 - 2² = 20344417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20344393 and 20344402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89510 + ... + 89736.

It is an arithmetic number, because the mean of its divisors is an integer number (1385100).

Almost surely, 2^20344421 is an apocalyptic number.

It is an amenable number.

20344421 is a deficient number, since it is larger than the sum of its proper divisors (1817179).

20344421 is a wasteful number, since it uses less digits than its factorization.

20344421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20344421 is about 4510.4790211240. The cubic root of 20344421 is about 272.9910725343.

Adding to 20344421 its reverse (12444302), we get a palindrome (32788723).

The spelling of 20344421 in words is "twenty million, three hundred forty-four thousand, four hundred twenty-one".