20937481 has 2 divisors, whose sum is σ = 20937482. Its totient is φ = 20937480.

The previous prime is 20937467. The next prime is 20937503. The reversal of 20937481 is 18473902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14561856 + 6375625 = 3816^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20937481 - 2¹¹ = 20935433 is a prime.

It is a super-2 number, since 2×20937481² = 876756221250722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20937181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468740 + 10468741.

It is an arithmetic number, because the mean of its divisors is an integer number (10468741).

Almost surely, 2^20937481 is an apocalyptic number.

It is an amenable number.

20937481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20937481 is an equidigital number, since it uses as much as digits as its factorization.

20937481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20937481 is about 4575.7492282685. The cubic root of 20937481 is about 275.6183594913.

The spelling of 20937481 in words is "twenty million, nine hundred thirty-seven thousand, four hundred eighty-one".