20999892 has 12 divisors (see below), whose sum is σ = 48999776. Its totient is φ = 6999960.

The previous prime is 20999887. The next prime is 20999893. The reversal of 20999892 is 29899902.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 874984 + ... + 875007.

Almost surely, 2^20999892 is an apocalyptic number.

It is an amenable number.

20999892 is an abundant number, since it is smaller than the sum of its proper divisors (27999884).

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

20999892 is a wasteful number, since it uses less digits than its factorization.

20999892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749998 (or 1749996 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 20999892 is about 4582.5639111746. The cubic root of 20999892 is about 275.8919446789.

The spelling of 20999892 in words is "twenty million, nine hundred ninety-nine thousand, eight hundred ninety-two".