20961992 has 32 divisors (see below), whose sum is σ = 40500000. Its totient is φ = 10167168.

The previous prime is 20961961. The next prime is 20962013. The reversal of 20961992 is 29916902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41759 + ... + 42257.

It is an arithmetic number, because the mean of its divisors is an integer number (1265625).

Almost surely, 2^20961992 is an apocalyptic number.

It is an amenable number.

20961992 is a deficient number, since it is larger than the sum of its proper divisors (19538008).

20961992 is a wasteful number, since it uses less digits than its factorization.

20961992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 20961992 is about 4578.4268040452. The cubic root of 20961992 is about 275.7258707862.

The spelling of 20961992 in words is "twenty million, nine hundred sixty-one thousand, nine hundred ninety-two".