20279943 has 24 divisors (see below), whose sum is σ = 30678000. Its totient is φ = 13240080.

The previous prime is 20279939. The next prime is 20279957. The reversal of 20279943 is 34997202.

It is not a de Polignac number, because 20279943 - 2² = 20279939 is a prime.

It is a super-2 number, since 2×20279943² = 822552176166498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20279898 and 20279907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20279923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136033 + ... + 136181.

It is an arithmetic number, because the mean of its divisors is an integer number (1278250).

Almost surely, 2^20279943 is an apocalyptic number.

20279943 is a deficient number, since it is larger than the sum of its proper divisors (10398057).

20279943 is an equidigital number, since it uses as much as digits as its factorization.

20279943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20279943 is about 4503.3257710275. The cubic root of 20279943 is about 272.7023685441.

The spelling of 20279943 in words is "twenty million, two hundred seventy-nine thousand, nine hundred forty-three".