20707080 has 64 divisors (see below), whose sum is σ = 63581760. Its totient is φ = 5392128.

The previous prime is 20707069. The next prime is 20707081. The reversal of 20707080 is 8070702.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20707080.

It is not an unprimeable number, because it can be changed into a prime (20707081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3154 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (993465).

Almost surely, 2^20707080 is an apocalyptic number.

20707080 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 20707080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31790880).

20707080 is an abundant number, since it is smaller than the sum of its proper divisors (42874680).

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

20707080 is a wasteful number, since it uses less digits than its factorization.

20707080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070 (or 4066 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 20707080 is about 4550.5032688704. The cubic root of 20707080 is about 274.6036383589.

Adding to 20707080 its reverse (8070702), we get a palindrome (28777782).

The spelling of 20707080 in words is "twenty million, seven hundred seven thousand, eighty".