20780000 has 60 divisors (see below), whose sum is σ = 51171120. Its totient is φ = 8304000.

The previous prime is 20779973. The next prime is 20780003. The reversal of 20780000 is 8702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19481 + ... + 20519.

It is an arithmetic number, because the mean of its divisors is an integer number (852852).

Almost surely, 2^20780000 is an apocalyptic number.

20780000 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 20780000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25585560).

20780000 is an abundant number, since it is smaller than the sum of its proper divisors (30391120).

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

20780000 is an equidigital number, since it uses as much as digits as its factorization.

20780000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20780000 is about 4558.5085280166. The cubic root of 20780000 is about 274.9255997078.

Adding to 20780000 its reverse (8702), we get a palindrome (20788702).

The spelling of 20780000 in words is "twenty million, seven hundred eighty thousand".