20162720 has 48 divisors (see below), whose sum is σ = 49714560. Its totient is φ = 7713024.

The previous prime is 20162717. The next prime is 20162761. The reversal of 20162720 is 2726102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20162692 and 20162701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941 + ... + 6419.

It is an arithmetic number, because the mean of its divisors is an integer number (1035720).

Almost surely, 2^20162720 is an apocalyptic number.

20162720 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 20162720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24857280).

20162720 is an abundant number, since it is smaller than the sum of its proper divisors (29551840).

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

20162720 is a wasteful number, since it uses less digits than its factorization.

20162720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5517 (or 5509 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20162720 is about 4490.2917499869. The cubic root of 20162720 is about 272.1759242534.

Adding to 20162720 its reverse (2726102), we get a palindrome (22888822).

The spelling of 20162720 in words is "twenty million, one hundred sixty-two thousand, seven hundred twenty".