26720993 has 16 divisors (see below), whose sum is σ = 29998416. Its totient is φ = 23639040.

The previous prime is 26720959. The next prime is 26721029. The reversal of 26720993 is 39902762.

It can be written as a sum of positive squares in 8 ways, for example, as 2347024 + 24373969 = 1532^2 + 4937^2 .

It is a cyclic number.

It is not a de Polignac number, because 26720993 - 2²⁰ = 25672417 is a prime.

It is a super-2 number, since 2×26720993² = 1428022933812098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (26720933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34733 + ... + 35493.

It is an arithmetic number, because the mean of its divisors is an integer number (1874901).

Almost surely, 2^26720993 is an apocalyptic number.

It is an amenable number.

26720993 is a deficient number, since it is larger than the sum of its proper divisors (3277423).

26720993 is a wasteful number, since it uses less digits than its factorization.

26720993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 26720993 is about 5169.2352432444. The cubic root of 26720993 is about 298.9630607267.

The spelling of 26720993 in words is "twenty-six million, seven hundred twenty thousand, nine hundred ninety-three".