20457473 has 2 divisors, whose sum is σ = 20457474. Its totient is φ = 20457472.

The previous prime is 20457461. The next prime is 20457487. The reversal of 20457473 is 37475402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13965169 + 6492304 = 3737^2 + 2548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20457473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20457413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228736 + 10228737.

It is an arithmetic number, because the mean of its divisors is an integer number (10228737).

Almost surely, 2^20457473 is an apocalyptic number.

It is an amenable number.

20457473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20457473 is an equidigital number, since it uses as much as digits as its factorization.

20457473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 32.

The square root of 20457473 is about 4522.9938094143. The cubic root of 20457473 is about 273.4958005298.

The spelling of 20457473 in words is "twenty million, four hundred fifty-seven thousand, four hundred seventy-three".