20851941 has 16 divisors (see below), whose sum is σ = 30786048. Its totient is φ = 12447600.

The previous prime is 20851937. The next prime is 20851951. The reversal of 20851941 is 14915802.

It is a happy number.

It is not a de Polignac number, because 20851941 - 2² = 20851937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20851899 and 20851908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20851951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2505 + ... + 6926.

It is an arithmetic number, because the mean of its divisors is an integer number (1924128).

Almost surely, 2^20851941 is an apocalyptic number.

It is an amenable number.

20851941 is a deficient number, since it is larger than the sum of its proper divisors (9934107).

20851941 is a wasteful number, since it uses less digits than its factorization.

20851941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9512.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20851941 is about 4566.3925586835. The cubic root of 20851941 is about 275.2425012456.

The spelling of 20851941 in words is "twenty million, eight hundred fifty-one thousand, nine hundred forty-one".