20704992 has 96 divisors (see below), whose sum is σ = 67785984. Its totient is φ = 5376000.

The previous prime is 20704987. The next prime is 20705017. The reversal of 20704992 is 29940702.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5992 + ... + 8792.

It is an arithmetic number, because the mean of its divisors is an integer number (706104).

Almost surely, 2^20704992 is an apocalyptic number.

20704992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20704992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33892992).

20704992 is an abundant number, since it is smaller than the sum of its proper divisors (47080992).

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

20704992 is a wasteful number, since it uses less digits than its factorization.

20704992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832 (or 2824 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20704992 is about 4550.2738379135. The cubic root of 20704992 is about 274.5944081556.

The spelling of 20704992 in words is "twenty million, seven hundred four thousand, nine hundred ninety-two".