20730407 has 2 divisors, whose sum is σ = 20730408. Its totient is φ = 20730406.

The previous prime is 20730373. The next prime is 20730421. The reversal of 20730407 is 70403702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20730407 - 2¹⁰ = 20729383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20730607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365203 + 10365204.

It is an arithmetic number, because the mean of its divisors is an integer number (10365204).

Almost surely, 2^20730407 is an apocalyptic number.

20730407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730407 is an equidigital number, since it uses as much as digits as its factorization.

20730407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 20730407 is about 4553.0656705126. The cubic root of 20730407 is about 274.7067154255.

The spelling of 20730407 in words is "twenty million, seven hundred thirty thousand, four hundred seven".