20346421 has 8 divisors (see below), whose sum is σ = 21329280. Its totient is φ = 19371792.

The previous prime is 20346407. The next prime is 20346427. The reversal of 20346421 is 12464302.

It is a happy number.

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 20346421 - 2⁹ = 20345909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20346392 and 20346401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20346427) 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, 3336 + ... + 7198.

It is an arithmetic number, because the mean of its divisors is an integer number (2666160).

Almost surely, 2^20346421 is an apocalyptic number.

It is an amenable number.

20346421 is a deficient number, since it is larger than the sum of its proper divisors (982859).

20346421 is a wasteful number, since it uses less digits than its factorization.

20346421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20346421 is about 4510.7007216174. The cubic root of 20346421 is about 273.0000178901. Note that the first 4 decimals are identical.

The spelling of 20346421 in words is "twenty million, three hundred forty-six thousand, four hundred twenty-one".