20404777 has 8 divisors (see below), whose sum is σ = 22350600. Its totient is φ = 18541824.

The previous prime is 20404771. The next prime is 20404801. The reversal of 20404777 is 77740402.

It can be written as a sum of positive squares in 4 ways, for example, as 7595536 + 12809241 = 2756^2 + 3579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20404777 - 2¹⁹ = 19880489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404771) 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 7 ways as a sum of consecutive naturals, for example, 20202 + ... + 21187.

It is an arithmetic number, because the mean of its divisors is an integer number (2793825).

Almost surely, 2^20404777 is an apocalyptic number.

It is an amenable number.

20404777 is a deficient number, since it is larger than the sum of its proper divisors (1945823).

20404777 is a wasteful number, since it uses less digits than its factorization.

20404777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41435.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20404777 is about 4517.1647080885. The cubic root of 20404777 is about 273.2607678013.

The spelling of 20404777 in words is "twenty million, four hundred four thousand, seven hundred seventy-seven".