20837449 has 2 divisors, whose sum is σ = 20837450. Its totient is φ = 20837448.

The previous prime is 20837441. The next prime is 20837459. The reversal of 20837449 is 94473802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1871424 = 4355^2 + 1368^2 .

It is a cyclic number.

It is not a de Polignac number, because 20837449 - 2³ = 20837441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20837441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418724 + 10418725.

It is an arithmetic number, because the mean of its divisors is an integer number (10418725).

Almost surely, 2^20837449 is an apocalyptic number.

It is an amenable number.

20837449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20837449 is an equidigital number, since it uses as much as digits as its factorization.

20837449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20837449 is about 4564.8054723066. The cubic root of 20837449 is about 275.1787223907.

The spelling of 20837449 in words is "twenty million, eight hundred thirty-seven thousand, four hundred forty-nine".