20720118 has 16 divisors (see below), whose sum is σ = 41596416. Its totient is φ = 6880680.

The previous prime is 20720113. The next prime is 20720131. The reversal of 20720118 is 81102702.

It is a junction number, because it is equal to n+sod(n) for n = 20720094 and 20720103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4746 + ... + 7997.

It is an arithmetic number, because the mean of its divisors is an integer number (2599776).

Almost surely, 2^20720118 is an apocalyptic number.

20720118 is an abundant number, since it is smaller than the sum of its proper divisors (20876298).

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

20720118 is a wasteful number, since it uses less digits than its factorization.

20720118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20720118 is about 4551.9356322338. The cubic root of 20720118 is about 274.6612600527.

The spelling of 20720118 in words is "twenty million, seven hundred twenty thousand, one hundred eighteen".