20375779 has 4 divisors (see below), whose sum is σ = 20416320. Its totient is φ = 20335240.

The previous prime is 20375743. The next prime is 20375783. The reversal of 20375779 is 97757302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97757302 = 2 ⋅48878651.

It is a cyclic number.

It is not a de Polignac number, because 20375779 - 2¹³ = 20367587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20375279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19507 + ... + 20524.

It is an arithmetic number, because the mean of its divisors is an integer number (5104080).

Almost surely, 2^20375779 is an apocalyptic number.

20375779 is a deficient number, since it is larger than the sum of its proper divisors (40541).

20375779 is an equidigital number, since it uses as much as digits as its factorization.

20375779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40540.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 20375779 is about 4513.9538101314. The cubic root of 20375779 is about 273.1312593629.

The spelling of 20375779 in words is "twenty million, three hundred seventy-five thousand, seven hundred seventy-nine".