20851242 has 8 divisors (see below), whose sum is σ = 41702496. Its totient is φ = 6950412.

The previous prime is 20851223. The next prime is 20851253. The reversal of 20851242 is 24215802.

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

20851242 is an admirable number.

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, 1737598 + ... + 1737609.

It is an arithmetic number, because the mean of its divisors is an integer number (5212812).

Almost surely, 2^20851242 is an apocalyptic number.

20851242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20851242 is a wasteful number, since it uses less digits than its factorization.

20851242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475212.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20851242 is about 4566.3160206013. The cubic root of 20851242 is about 275.2394256460.

The spelling of 20851242 in words is "twenty million, eight hundred fifty-one thousand, two hundred forty-two".