20130780 has 96 divisors (see below), whose sum is σ = 59351040. Its totient is φ = 5091840.

The previous prime is 20130779. The next prime is 20130791. The reversal of 20130780 is 8703102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146872 + ... + 147008.

It is an arithmetic number, because the mean of its divisors is an integer number (618240).

Almost surely, 2^20130780 is an apocalyptic number.

20130780 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 20130780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29675520).

20130780 is an abundant number, since it is smaller than the sum of its proper divisors (39220260).

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

20130780 is a wasteful number, since it uses less digits than its factorization.

20130780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20130780 is about 4486.7337785966. The cubic root of 20130780 is about 272.0321292785.

Adding to 20130780 its reverse (8703102), we get a palindrome (28833882).

It can be divided in two parts, 20130 and 780, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20130780 in words is "twenty million, one hundred thirty thousand, seven hundred eighty".