20046421 has 2 divisors, whose sum is σ = 20046422. Its totient is φ = 20046420.

The previous prime is 20046419. The next prime is 20046427. The reversal of 20046421 is 12464002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13359025 + 6687396 = 3655^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 20046421 - 2¹ = 20046419 is a prime.

Together with 20046419, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20046427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023210 + 10023211.

It is an arithmetic number, because the mean of its divisors is an integer number (10023211).

Almost surely, 2^20046421 is an apocalyptic number.

It is an amenable number.

20046421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20046421 is an equidigital number, since it uses as much as digits as its factorization.

20046421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20046421 is about 4477.3229724915. The cubic root of 20046421 is about 271.6516093544.

The spelling of 20046421 in words is "twenty million, forty-six thousand, four hundred twenty-one".