20272780 has 48 divisors (see below), whose sum is σ = 47545344. Its totient is φ = 7197120.

The previous prime is 20272771. The next prime is 20272783. The reversal of 20272780 is 8727202.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20272783) 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, 8389 + ... + 10531.

It is an arithmetic number, because the mean of its divisors is an integer number (990528).

Almost surely, 2^20272780 is an apocalyptic number.

20272780 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 20272780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23772672).

20272780 is an abundant number, since it is smaller than the sum of its proper divisors (27272564).

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

20272780 is a wasteful number, since it uses less digits than its factorization.

20272780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206 (or 2204 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20272780 is about 4502.5303996753. The cubic root of 20272780 is about 272.6702580480.

Adding to 20272780 its reverse (8727202), we get a palindrome (28999982).

The spelling of 20272780 in words is "twenty million, two hundred seventy-two thousand, seven hundred eighty".