20681488 has 10 divisors (see below), whose sum is σ = 40070414. Its totient is φ = 10340736.

The previous prime is 20681477. The next prime is 20681491. The reversal of 20681488 is 88418602.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 861184 = 4452^2 + 928^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 646281 + ... + 646312.

Almost surely, 2^20681488 is an apocalyptic number.

It is an amenable number.

20681488 is a deficient number, since it is larger than the sum of its proper divisors (19388926).

20681488 is a wasteful number, since it uses less digits than its factorization.

20681488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292601 (or 1292595 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 20681488 is about 4547.6904028309. The cubic root of 20681488 is about 274.4904636464.

The spelling of 20681488 in words is "twenty million, six hundred eighty-one thousand, four hundred eighty-eight".