20077805 has 16 divisors (see below), whose sum is σ = 26417664. Its totient is φ = 14527680.

The previous prime is 20077769. The next prime is 20077807. The reversal of 20077805 is 50877002.

It is not a de Polignac number, because 20077805 - 2¹⁰ = 20076781 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 (20077807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11447 + ... + 13083.

It is an arithmetic number, because the mean of its divisors is an integer number (1651104).

Almost surely, 2^20077805 is an apocalyptic number.

It is an amenable number.

20077805 is a deficient number, since it is larger than the sum of its proper divisors (6339859).

20077805 is a wasteful number, since it uses less digits than its factorization.

20077805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 20077805 is about 4480.8263746769. The cubic root of 20077805 is about 271.7932983021.

The spelling of 20077805 in words is "twenty million, seventy-seven thousand, eight hundred five".