20851942 has 8 divisors (see below), whose sum is σ = 32123376. Its totient is φ = 10144152.

The previous prime is 20851937. The next prime is 20851951. The reversal of 20851942 is 24915802.

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

It is a congruent 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, 140818 + ... + 140965.

It is an arithmetic number, because the mean of its divisors is an integer number (4015422).

Almost surely, 2^20851942 is an apocalyptic number.

20851942 is a deficient number, since it is larger than the sum of its proper divisors (11271434).

20851942 is a wasteful number, since it uses less digits than its factorization.

20851942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281822.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 20851942 is about 4566.3926681791. The cubic root of 20851942 is about 275.2425056455.

The spelling of 20851942 in words is "twenty million, eight hundred fifty-one thousand, nine hundred forty-two".