20957764 has 12 divisors (see below), whose sum is σ = 36773100. Its totient is φ = 10451168.

The previous prime is 20957731. The next prime is 20957777. The reversal of 20957764 is 46775902.

It can be written as a sum of positive squares in 2 ways, for example, as 9000000 + 11957764 = 3000^2 + 3458^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5179 + ... + 8290.

It is an arithmetic number, because the mean of its divisors is an integer number (3064425).

Almost surely, 2^20957764 is an apocalyptic number.

It is an amenable number.

20957764 is a deficient number, since it is larger than the sum of its proper divisors (15815336).

20957764 is a wasteful number, since it uses less digits than its factorization.

20957764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13862 (or 13860 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 20957764 is about 4577.9650501069. The cubic root of 20957764 is about 275.7073317185.

The spelling of 20957764 in words is "twenty million, nine hundred fifty-seven thousand, seven hundred sixty-four".