20411720 has 64 divisors (see below), whose sum is σ = 52876800. Its totient is φ = 6946560.

The previous prime is 20411717. The next prime is 20411723. The reversal of 20411720 is 2711402.

It is an interprime number because it is at equal distance from previous prime (20411717) and next prime (20411723).

It is not an unprimeable number, because it can be changed into a prime (20411723) by changing a digit.

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, 75185 + ... + 75455.

It is an arithmetic number, because the mean of its divisors is an integer number (826200).

Almost surely, 2^20411720 is an apocalyptic number.

20411720 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 20411720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26438400).

20411720 is an abundant number, since it is smaller than the sum of its proper divisors (32465080).

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

20411720 is a wasteful number, since it uses less digits than its factorization.

20411720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20411720 is about 4517.9331557694. The cubic root of 20411720 is about 273.2917578380.

The spelling of 20411720 in words is "twenty million, four hundred eleven thousand, seven hundred twenty".