20254009 has 2 divisors, whose sum is σ = 20254010. Its totient is φ = 20254008.

The previous prime is 20253979. The next prime is 20254049. The reversal of 20254009 is 90045202.

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., 14745600 + 5508409 = 3840^2 + 2347^2 .

It is a cyclic number.

It is not a de Polignac number, because 20254009 - 2²¹ = 18156857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20254049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127004 + 10127005.

It is an arithmetic number, because the mean of its divisors is an integer number (10127005).

Almost surely, 2^20254009 is an apocalyptic number.

It is an amenable number.

20254009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20254009 is an equidigital number, since it uses as much as digits as its factorization.

20254009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20254009 is about 4500.4454223999. The cubic root of 20254009 is about 272.5860749885.

The spelling of 20254009 in words is "twenty million, two hundred fifty-four thousand, nine".