20810435677 has 4 divisors (see below), whose sum is σ = 20813427936. Its totient is φ = 20807443420.

The previous prime is 20810435647. The next prime is 20810435741. The reversal of 20810435677 is 77653401802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20810435677 - 2⁷ = 20810435549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20810435647) 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, 1485673 + ... + 1499614.

It is an arithmetic number, because the mean of its divisors is an integer number (5203356984).

Almost surely, 2^20810435677 is an apocalyptic number.

It is an amenable number.

20810435677 is a deficient number, since it is larger than the sum of its proper divisors (2992259).

20810435677 is an equidigital number, since it uses as much as digits as its factorization.

20810435677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992258.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 20810435677 in words is "twenty billion, eight hundred ten million, four hundred thirty-five thousand, six hundred seventy-seven".