20740280 has 32 divisors (see below), whose sum is σ = 50909040. Its totient is φ = 7541760.

The previous prime is 20740261. The next prime is 20740297. The reversal of 20740280 is 8204702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23129 + ... + 24008.

Almost surely, 2^20740280 is an apocalyptic number.

20740280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20740280 is an abundant number, since it is smaller than the sum of its proper divisors (30168760).

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

20740280 is a wasteful number, since it uses less digits than its factorization.

20740280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47159 (or 47155 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20740280 is about 4554.1497559918. The cubic root of 20740280 is about 274.7503188297.

Adding to 20740280 its reverse (8204702), we get a palindrome (28944982).

The spelling of 20740280 in words is "twenty million, seven hundred forty thousand, two hundred eighty".