3920020655 has 4 divisors (see below), whose sum is σ = 4704024792. Its totient is φ = 3136016520.

The previous prime is 3920020639. The next prime is 3920020681. The reversal of 3920020655 is 5560200293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5560200293 = 22391 ⋅248323.

It is not a de Polignac number, because 3920020655 - 2⁴ = 3920020639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392002061 + ... + 392002070.

It is an arithmetic number, because the mean of its divisors is an integer number (1176006198).

Almost surely, 2^3920020655 is an apocalyptic number.

3920020655 is a deficient number, since it is larger than the sum of its proper divisors (784004137).

3920020655 is an equidigital number, since it uses as much as digits as its factorization.

3920020655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784004136.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 3920020655 is about 62610.0683197200. The cubic root of 3920020655 is about 1576.7498019793.

The spelling of 3920020655 in words is "three billion, nine hundred twenty million, twenty thousand, six hundred fifty-five".