20994320 has 80 divisors (see below), whose sum is σ = 53032320. Its totient is φ = 7698432.

The previous prime is 20994319. The next prime is 20994343. The reversal of 20994320 is 2349902.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20994320² = 881522944524800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58301 + ... + 58659.

It is an arithmetic number, because the mean of its divisors is an integer number (662904).

Almost surely, 2^20994320 is an apocalyptic number.

20994320 is a gapful number since it is divisible by the number (20) 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 20994320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26516160).

20994320 is an abundant number, since it is smaller than the sum of its proper divisors (32038000).

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

20994320 is a wasteful number, since it uses less digits than its factorization.

20994320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20994320 is about 4581.9559142358. The cubic root of 20994320 is about 275.8675412851.

The spelling of 20994320 in words is "twenty million, nine hundred ninety-four thousand, three hundred twenty".