20733481 has 2 divisors, whose sum is σ = 20733482. Its totient is φ = 20733480.

The previous prime is 20733467. The next prime is 20733487. The reversal of 20733481 is 18433702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10621081 + 10112400 = 3259^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20733481 - 2¹⁷ = 20602409 is a prime.

It is a super-2 number, since 2×20733481² = 859754468754722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20733487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366740 + 10366741.

It is an arithmetic number, because the mean of its divisors is an integer number (10366741).

Almost surely, 2^20733481 is an apocalyptic number.

It is an amenable number.

20733481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20733481 is an equidigital number, since it uses as much as digits as its factorization.

20733481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20733481 is about 4553.4032327480. The cubic root of 20733481 is about 274.7202930124.

The spelling of 20733481 in words is "twenty million, seven hundred thirty-three thousand, four hundred eighty-one".