20627280 has 60 divisors (see below), whose sum is σ = 69275700. Its totient is φ = 5500416.

The previous prime is 20627249. The next prime is 20627281. The reversal of 20627280 is 8272602.

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 12194064 = 2904^2 + 3492^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20627281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13605 + ... + 15044.

It is an arithmetic number, because the mean of its divisors is an integer number (1154595).

Almost surely, 2^20627280 is an apocalyptic number.

20627280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20627280 is an abundant number, since it is smaller than the sum of its proper divisors (48648420).

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

20627280 is a wasteful number, since it uses less digits than its factorization.

20627280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28668 (or 28659 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20627280 is about 4541.7265439478. The cubic root of 20627280 is about 274.2504325898.

Adding to 20627280 its reverse (8272602), we get a palindrome (28899882).

The spelling of 20627280 in words is "twenty million, six hundred twenty-seven thousand, two hundred eighty".