20278079 has 2 divisors, whose sum is σ = 20278080. Its totient is φ = 20278078.

The previous prime is 20278057. The next prime is 20278091. The reversal of 20278079 is 97087202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20278079 - 2²⁰ = 19229503 is a prime.

It is a super-2 number, since 2×20278079² = 822400975860482, 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 (20278579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139039 + 10139040.

It is an arithmetic number, because the mean of its divisors is an integer number (10139040).

Almost surely, 2^20278079 is an apocalyptic number.

20278079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20278079 is an equidigital number, since it uses as much as digits as its factorization.

20278079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 20278079 is about 4503.1188081151. The cubic root of 20278079 is about 272.6940132808.

The spelling of 20278079 in words is "twenty million, two hundred seventy-eight thousand, seventy-nine".