20077761 has 16 divisors (see below), whose sum is σ = 29423808. Its totient is φ = 12076800.

The previous prime is 20077751. The next prime is 20077769. The reversal of 20077761 is 16777002.

It is a happy number.

It is not a de Polignac number, because 20077761 - 2⁷ = 20077633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20077769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2301 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (1838988).

Almost surely, 2^20077761 is an apocalyptic number.

It is an amenable number.

20077761 is a deficient number, since it is larger than the sum of its proper divisors (9346047).

20077761 is a wasteful number, since it uses less digits than its factorization.

20077761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 20077761 is about 4480.8214648656. The cubic root of 20077761 is about 271.7930997593.

The spelling of 20077761 in words is "twenty million, seventy-seven thousand, seven hundred sixty-one".