20850437 has 2 divisors, whose sum is σ = 20850438. Its totient is φ = 20850436.

The previous prime is 20850409. The next prime is 20850439. The reversal of 20850437 is 73405802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 1437601 = 4406^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 20850437 - 2¹² = 20846341 is a prime.

Together with 20850439, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20850439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10425218 + 10425219.

It is an arithmetic number, because the mean of its divisors is an integer number (10425219).

Almost surely, 2^20850437 is an apocalyptic number.

It is an amenable number.

20850437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20850437 is an equidigital number, since it uses as much as digits as its factorization.

20850437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20850437 is about 4566.2278742962. The cubic root of 20850437 is about 275.2358835615.

The spelling of 20850437 in words is "twenty million, eight hundred fifty thousand, four hundred thirty-seven".