20934720 has 112 divisors (see below), whose sum is σ = 73883520. Its totient is φ = 5580288.

The previous prime is 20934709. The next prime is 20934731. The reversal of 20934720 is 2743902.

It is an interprime number because it is at equal distance from previous prime (20934709) and next prime (20934731).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7429 + ... + 9851.

Almost surely, 2^20934720 is an apocalyptic number.

20934720 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 20934720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36941760).

20934720 is an abundant number, since it is smaller than the sum of its proper divisors (52948800).

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

20934720 is a wasteful number, since it uses less digits than its factorization.

20934720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449 (or 2433 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20934720 is about 4575.4475190958. The cubic root of 20934720 is about 275.6062438067.

The spelling of 20934720 in words is "twenty million, nine hundred thirty-four thousand, seven hundred twenty".