20671916 has 24 divisors (see below), whose sum is σ = 38148096. Its totient is φ = 9786960.

The previous prime is 20671907. The next prime is 20671919. The reversal of 20671916 is 61917602.

It is a happy number.

It is a super-2 number, since 2×20671916² = 854656222222112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20671919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4055 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (1589504).

Almost surely, 2^20671916 is an apocalyptic number.

It is an amenable number.

20671916 is a deficient number, since it is larger than the sum of its proper divisors (17476180).

20671916 is a wasteful number, since it uses less digits than its factorization.

20671916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629 (or 3627 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20671916 is about 4546.6378786967. The cubic root of 20671916 is about 274.4481096956.

The spelling of 20671916 in words is "twenty million, six hundred seventy-one thousand, nine hundred sixteen".