20937733 has 2 divisors, whose sum is σ = 20937734. Its totient is φ = 20937732.

The previous prime is 20937691. The next prime is 20937767. The reversal of 20937733 is 33773902.

It is an a-pointer prime, because the next prime (20937767) can be obtained adding 20937733 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 2815684 = 4257^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 20937733 - 2¹⁷ = 20806661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20937773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468866 + 10468867.

It is an arithmetic number, because the mean of its divisors is an integer number (10468867).

Almost surely, 2^20937733 is an apocalyptic number.

It is an amenable number.

20937733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20937733 is an equidigital number, since it uses as much as digits as its factorization.

20937733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 34.

The square root of 20937733 is about 4575.7767646597. The cubic root of 20937733 is about 275.6194652522.

The spelling of 20937733 in words is "twenty million, nine hundred thirty-seven thousand, seven hundred thirty-three".