20797320 has 64 divisors (see below), whose sum is σ = 63296640. Its totient is φ = 5465600.

The previous prime is 20797277. The next prime is 20797339. The reversal of 20797320 is 2379702.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7300 + ... + 9740.

It is an arithmetic number, because the mean of its divisors is an integer number (989010).

Almost surely, 2^20797320 is an apocalyptic number.

20797320 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 20797320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31648320).

20797320 is an abundant number, since it is smaller than the sum of its proper divisors (42499320).

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

20797320 is a wasteful number, since it uses less digits than its factorization.

20797320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526 (or 2522 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 20797320 is about 4560.4078764953. The cubic root of 20797320 is about 275.0019614185.

The spelling of 20797320 in words is "twenty million, seven hundred ninety-seven thousand, three hundred twenty".