20842642 has 8 divisors (see below), whose sum is σ = 31320432. Its totient is φ = 10402500.

The previous prime is 20842631. The next prime is 20842673. The reversal of 20842642 is 24624802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20842642.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7984 + ... + 10267.

It is an arithmetic number, because the mean of its divisors is an integer number (3915054).

Almost surely, 2^20842642 is an apocalyptic number.

20842642 is a deficient number, since it is larger than the sum of its proper divisors (10477790).

20842642 is a wasteful number, since it uses less digits than its factorization.

20842642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18824.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20842642 is about 4565.3742453385. The cubic root of 20842642 is about 275.2015800257.

The spelling of 20842642 in words is "twenty million, eight hundred forty-two thousand, six hundred forty-two".