20278741 has 4 divisors (see below), whose sum is σ = 23175712. Its totient is φ = 17381772.

The previous prime is 20278729. The next prime is 20278759. The reversal of 20278741 is 14787202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20278741 - 2⁷ = 20278613 is a prime.

It is a super-2 number, since 2×20278741² = 822454673090162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448475 + ... + 1448488.

It is an arithmetic number, because the mean of its divisors is an integer number (5793928).

Almost surely, 2^20278741 is an apocalyptic number.

It is an amenable number.

20278741 is a deficient number, since it is larger than the sum of its proper divisors (2896971).

20278741 is an equidigital number, since it uses as much as digits as its factorization.

20278741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896970.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20278741 is about 4503.1923121270. The cubic root of 20278741 is about 272.6969807130.

The spelling of 20278741 in words is "twenty million, two hundred seventy-eight thousand, seven hundred forty-one".