20473421 has 2 divisors, whose sum is σ = 20473422. Its totient is φ = 20473420.

The previous prime is 20473399. The next prime is 20473429. The reversal of 20473421 is 12437402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 990025 = 4414^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 20473421 - 2¹⁴ = 20457037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20473429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236710 + 10236711.

It is an arithmetic number, because the mean of its divisors is an integer number (10236711).

Almost surely, 2^20473421 is an apocalyptic number.

It is an amenable number.

20473421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20473421 is an equidigital number, since it uses as much as digits as its factorization.

20473421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20473421 is about 4524.7564575345. The cubic root of 20473421 is about 273.5668516333.

The spelling of 20473421 in words is "twenty million, four hundred seventy-three thousand, four hundred twenty-one".