20986992 has 160 divisors (see below), whose sum is σ = 67287360. Its totient is φ = 6220800.

The previous prime is 20986991. The next prime is 20987023. The reversal of 20986992 is 29968902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207742 + ... + 207842.

It is an arithmetic number, because the mean of its divisors is an integer number (420546).

Almost surely, 2^20986992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20986992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33643680).

20986992 is an abundant number, since it is smaller than the sum of its proper divisors (46300368).

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

20986992 is a wasteful number, since it uses less digits than its factorization.

20986992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20986992 is about 4581.1561859426. The cubic root of 20986992 is about 275.8354406567.

The spelling of 20986992 in words is "twenty million, nine hundred eighty-six thousand, nine hundred ninety-two".