20562481 has 2 divisors, whose sum is σ = 20562482. Its totient is φ = 20562480.

The previous prime is 20562473. The next prime is 20562499. The reversal of 20562481 is 18426502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 312481 = 4500^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20562481 - 2³ = 20562473 is a prime.

It is a super-2 number, since 2×20562481² = 845631249750722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20562431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281240 + 10281241.

It is an arithmetic number, because the mean of its divisors is an integer number (10281241).

Almost surely, 2^20562481 is an apocalyptic number.

It is an amenable number.

20562481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20562481 is an equidigital number, since it uses as much as digits as its factorization.

20562481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20562481 is about 4534.5871917960. The cubic root of 20562481 is about 273.9629525274.

Adding to 20562481 its reverse (18426502), we get a palindrome (38988983).

The spelling of 20562481 in words is "twenty million, five hundred sixty-two thousand, four hundred eighty-one".