20190780 has 72 divisors (see below), whose sum is σ = 63921312. Its totient is φ = 5149056.

The previous prime is 20190763. The next prime is 20190811. The reversal of 20190780 is 8709102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1702 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (887796).

Almost surely, 2^20190780 is an apocalyptic number.

20190780 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 20190780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31960656).

20190780 is an abundant number, since it is smaller than the sum of its proper divisors (43730532).

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

20190780 is a wasteful number, since it uses less digits than its factorization.

20190780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915 (or 4910 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20190780 is about 4493.4151822417. The cubic root of 20190780 is about 272.3021260804.

Adding to 20190780 its reverse (8709102), we get a palindrome (28899882).

The spelling of 20190780 in words is "twenty million, one hundred ninety thousand, seven hundred eighty".