20730481 has 2 divisors, whose sum is σ = 20730482. Its totient is φ = 20730480.

The previous prime is 20730439. The next prime is 20730491. The reversal of 20730481 is 18403702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 3549456 = 4145^2 + 1884^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730481 - 2¹⁵ = 20697713 is a prime.

It is a super-2 number, since 2×20730481² = 859505684982722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20730421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365240 + 10365241.

It is an arithmetic number, because the mean of its divisors is an integer number (10365241).

Almost surely, 2^20730481 is an apocalyptic number.

It is an amenable number.

20730481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730481 is an equidigital number, since it uses as much as digits as its factorization.

20730481 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 25.

The square root of 20730481 is about 4553.0737968981. The cubic root of 20730481 is about 274.7070422927.

The spelling of 20730481 in words is "twenty million, seven hundred thirty thousand, four hundred eighty-one".