20278253 has 2 divisors, whose sum is σ = 20278254. Its totient is φ = 20278252.

The previous prime is 20278201. The next prime is 20278259. The reversal of 20278253 is 35287202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20187049 + 91204 = 4493^2 + 302^2 .

It is a cyclic number.

It is not a de Polignac number, because 20278253 - 2¹² = 20274157 is a prime.

It is a super-2 number, since 2×20278253² = 822415089464018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20278259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139126 + 10139127.

It is an arithmetic number, because the mean of its divisors is an integer number (10139127).

Almost surely, 2^20278253 is an apocalyptic number.

It is an amenable number.

20278253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20278253 is an equidigital number, since it uses as much as digits as its factorization.

20278253 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 20278253 is about 4503.1381280169. The cubic root of 20278253 is about 272.6947932466.

The spelling of 20278253 in words is "twenty million, two hundred seventy-eight thousand, two hundred fifty-three".