20662642 has 32 divisors (see below), whose sum is σ = 41618304. Its totient is φ = 7430400.

The previous prime is 20662637. The next prime is 20662643. The reversal of 20662642 is 24626602.

It is a self number, because there is not a number n which added to its sum of digits gives 20662642.

It is not an unprimeable number, because it can be changed into a prime (20662643) 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 15 ways as a sum of consecutive naturals, for example, 3159 + ... + 7162.

It is an arithmetic number, because the mean of its divisors is an integer number (1300572).

Almost surely, 2^20662642 is an apocalyptic number.

20662642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20662642 is an abundant number, since it is smaller than the sum of its proper divisors (20955662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20662642 is a wasteful number, since it uses less digits than its factorization.

20662642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10354.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20662642 is about 4545.6178897923. The cubic root of 20662642 is about 274.4070618559.

The spelling of 20662642 in words is "twenty million, six hundred sixty-two thousand, six hundred forty-two".