20937437 has 2 divisors, whose sum is σ = 20937438. Its totient is φ = 20937436.

The previous prime is 20937409. The next prime is 20937443. The reversal of 20937437 is 73473902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20693401 + 244036 = 4549^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 20937437 - 2⁸ = 20937181 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20937397 and 20937406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20937467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468718 + 10468719.

It is an arithmetic number, because the mean of its divisors is an integer number (10468719).

Almost surely, 2^20937437 is an apocalyptic number.

It is an amenable number.

20937437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20937437 is an equidigital number, since it uses as much as digits as its factorization.

20937437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 20937437 is about 4575.7444203102. The cubic root of 20937437 is about 275.6181664210.

The spelling of 20937437 in words is "twenty million, nine hundred thirty-seven thousand, four hundred thirty-seven".