20031421 has 8 divisors (see below), whose sum is σ = 20599040. Its totient is φ = 19468512.

The previous prime is 20031409. The next prime is 20031439. The reversal of 20031421 is 12413002.

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

It is a cyclic number.

It is not a de Polignac number, because 20031421 - 2⁷ = 20031293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8545 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (2574880).

Almost surely, 2^20031421 is an apocalyptic number.

It is an amenable number.

20031421 is a deficient number, since it is larger than the sum of its proper divisors (567619).

20031421 is a wasteful number, since it uses less digits than its factorization.

20031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20031421 is about 4475.6475509137. The cubic root of 20031421 is about 271.5838368096.

Adding to 20031421 its reverse (12413002), we get a palindrome (32444423).

The spelling of 20031421 in words is "twenty million, thirty-one thousand, four hundred twenty-one".