20660740 has 12 divisors (see below), whose sum is σ = 43387596. Its totient is φ = 8264288.

The previous prime is 20660701. The next prime is 20660743. The reversal of 20660740 is 4706602.

It can be written as a sum of positive squares in 2 ways, for example, as 8213956 + 12446784 = 2866^2 + 3528^2 .

It is not an unprimeable number, because it can be changed into a prime (20660743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516499 + ... + 516538.

It is an arithmetic number, because the mean of its divisors is an integer number (3615633).

Almost surely, 2^20660740 is an apocalyptic number.

20660740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20660740 is an abundant number, since it is smaller than the sum of its proper divisors (22726856).

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

20660740 is a wasteful number, since it uses less digits than its factorization.

20660740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033046 (or 1033044 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20660740 is about 4545.4086724958. The cubic root of 20660740 is about 274.3986418574.

The spelling of 20660740 in words is "twenty million, six hundred sixty thousand, seven hundred forty".