20607779 has 4 divisors (see below), whose sum is σ = 21164784. Its totient is φ = 20050776.

The previous prime is 20607767. The next prime is 20607781. The reversal of 20607779 is 97770602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20607779 - 2⁸ = 20607523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20607709) 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 3 ways as a sum of consecutive naturals, for example, 278447 + ... + 278520.

It is an arithmetic number, because the mean of its divisors is an integer number (5291196).

Almost surely, 2^20607779 is an apocalyptic number.

20607779 is a deficient number, since it is larger than the sum of its proper divisors (557005).

20607779 is an equidigital number, since it uses as much as digits as its factorization.

20607779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557004.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 20607779 is about 4539.5791655174. The cubic root of 20607779 is about 274.1639800223.

The spelling of 20607779 in words is "twenty million, six hundred seven thousand, seven hundred seventy-nine".