20708020 has 24 divisors (see below), whose sum is σ = 43785000. Its totient is φ = 8226432.

The previous prime is 20708011. The next prime is 20708021. The reversal of 20708020 is 2080702.

It can be written as a sum of positive squares in 4 ways, for example, as 1993744 + 18714276 = 1412^2 + 4326^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708021) 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, 495 + ... + 6454.

It is an arithmetic number, because the mean of its divisors is an integer number (1824375).

Almost surely, 2^20708020 is an apocalyptic number.

20708020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20708020 is an abundant number, since it is smaller than the sum of its proper divisors (23076980).

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

20708020 is a wasteful number, since it uses less digits than its factorization.

20708020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107 (or 7105 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20708020 is about 4550.6065529773. The cubic root of 20708020 is about 274.6077935160.

Adding to 20708020 its reverse (2080702), we get a palindrome (22788722).

The spelling of 20708020 in words is "twenty million, seven hundred eight thousand, twenty".