20254309 has 2 divisors, whose sum is σ = 20254310. Its totient is φ = 20254308.

The previous prime is 20254291. The next prime is 20254313. The reversal of 20254309 is 90345202.

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., 20205025 + 49284 = 4495^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 20254309 - 2⁵ = 20254277 is a prime.

It is equal to p_1285711 and since 20254309 and 1285711 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20254319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127154 + 10127155.

It is an arithmetic number, because the mean of its divisors is an integer number (10127155).

Almost surely, 2^20254309 is an apocalyptic number.

It is an amenable number.

20254309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20254309 is an equidigital number, since it uses as much as digits as its factorization.

20254309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20254309 is about 4500.4787523107. The cubic root of 20254309 is about 272.5874208194.

The spelling of 20254309 in words is "twenty million, two hundred fifty-four thousand, three hundred nine".