20742884 has 12 divisors (see below), whose sum is σ = 37185708. Its totient is φ = 10118400.

The previous prime is 20742881. The next prime is 20742893. The reversal of 20742884 is 48824702.

It can be written as a sum of positive squares in 2 ways, for example, as 2166784 + 18576100 = 1472^2 + 4310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742881) 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 3 ways as a sum of consecutive naturals, for example, 63077 + ... + 63404.

It is an arithmetic number, because the mean of its divisors is an integer number (3098809).

Almost surely, 2^20742884 is an apocalyptic number.

It is an amenable number.

20742884 is a deficient number, since it is larger than the sum of its proper divisors (16442824).

20742884 is a wasteful number, since it uses less digits than its factorization.

20742884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126526 (or 126524 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 20742884 is about 4554.4356401205. The cubic root of 20742884 is about 274.7618169048.

The spelling of 20742884 in words is "twenty million, seven hundred forty-two thousand, eight hundred eighty-four".