20461279 has 2 divisors, whose sum is σ = 20461280. Its totient is φ = 20461278.

The previous prime is 20461253. The next prime is 20461297. The reversal of 20461279 is 97216402.

Together with next prime (20461297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20461279 - 2⁷ = 20461151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20461279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20461579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230639 + 10230640.

It is an arithmetic number, because the mean of its divisors is an integer number (10230640).

Almost surely, 2^20461279 is an apocalyptic number.

20461279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20461279 is an equidigital number, since it uses as much as digits as its factorization.

20461279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20461279 is about 4523.4145288709. The cubic root of 20461279 is about 273.5127602730.

The spelling of 20461279 in words is "twenty million, four hundred sixty-one thousand, two hundred seventy-nine".