20443642 has 16 divisors (see below), whose sum is σ = 32114880. Its totient is φ = 9741952.

The previous prime is 20443627. The next prime is 20443667. The reversal of 20443642 is 24634402.

It is a super-3 number, since 3×20443642³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15609 + ... + 16867.

It is an arithmetic number, because the mean of its divisors is an integer number (2007180).

Almost surely, 2^20443642 is an apocalyptic number.

20443642 is a deficient number, since it is larger than the sum of its proper divisors (11671238).

20443642 is a wasteful number, since it uses less digits than its factorization.

20443642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20443642 is about 4521.4645857288. The cubic root of 20443642 is about 273.4341511231.

The spelling of 20443642 in words is "twenty million, four hundred forty-three thousand, six hundred forty-two".