20779407 has 24 divisors (see below), whose sum is σ = 34469760. Its totient is φ = 11929680.

The previous prime is 20779397. The next prime is 20779411. The reversal of 20779407 is 70497702.

It is not a de Polignac number, because 20779407 - 2¹¹ = 20777359 is a prime.

It is a super-3 number, since 3×20779407³ (a number of 23 digits) contains 333 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779427) 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, 3643 + ... + 7404.

It is an arithmetic number, because the mean of its divisors is an integer number (1436240).

Almost surely, 2^20779407 is an apocalyptic number.

20779407 is a deficient number, since it is larger than the sum of its proper divisors (13690353).

20779407 is a wasteful number, since it uses less digits than its factorization.

20779407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11083 (or 11080 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20779407 is about 4558.4434843486. The cubic root of 20779407 is about 274.9229844939.

The spelling of 20779407 in words is "twenty million, seven hundred seventy-nine thousand, four hundred seven".