20660474 has 16 divisors (see below), whose sum is σ = 33616296. Its totient is φ = 9484800.

The previous prime is 20660473. The next prime is 20660483. The reversal of 20660474 is 47406602.

It can be written as a sum of positive squares in 4 ways, for example, as 14876449 + 5784025 = 3857^2 + 2405^2 .

It is not an unprimeable number, because it can be changed into a prime (20660473) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6017 + ... + 8804.

Almost surely, 2^20660474 is an apocalyptic number.

20660474 is a deficient number, since it is larger than the sum of its proper divisors (12955822).

20660474 is a wasteful number, since it uses less digits than its factorization.

20660474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14881.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20660474 is about 4545.3794121063. The cubic root of 20660474 is about 274.3974642559.

The spelling of 20660474 in words is "twenty million, six hundred sixty thousand, four hundred seventy-four".