20870449 has 2 divisors, whose sum is σ = 20870450. Its totient is φ = 20870448.

The previous prime is 20870429. The next prime is 20870467. The reversal of 20870449 is 94407802.

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., 17514225 + 3356224 = 4185^2 + 1832^2 .

It is a cyclic number.

It is not a de Polignac number, because 20870449 - 2⁷ = 20870321 is a prime.

It is not a weakly prime, because it can be changed into another prime (20870429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435224 + 10435225.

It is an arithmetic number, because the mean of its divisors is an integer number (10435225).

Almost surely, 2^20870449 is an apocalyptic number.

It is an amenable number.

20870449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20870449 is an equidigital number, since it uses as much as digits as its factorization.

20870449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20870449 is about 4568.4186541953. The cubic root of 20870449 is about 275.3239114409.

The spelling of 20870449 in words is "twenty million, eight hundred seventy thousand, four hundred forty-nine".