20320704 has 42 divisors (see below), whose sum is σ = 58247280. Its totient is φ = 6773376.

The previous prime is 20320687. The next prime is 20320711. The reversal of 20320704 is 40702302.

It is a happy number.

It is a super-2 number, since 2×20320704² = 825862022111232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17064 + ... + 18215.

It is an arithmetic number, because the mean of its divisors is an integer number (1386840).

Almost surely, 2^20320704 is an apocalyptic number.

20320704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20320704 is an abundant number, since it is smaller than the sum of its proper divisors (37926576).

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

20320704 is a wasteful number, since it uses less digits than its factorization.

20320704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35297 (or 35284 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20320704 is about 4507.8491545304. The cubic root of 20320704 is about 272.8849493070.

The spelling of 20320704 in words is "twenty million, three hundred twenty thousand, seven hundred four".