20980240 has 20 divisors (see below), whose sum is σ = 48779244. Its totient is φ = 8392064.

The previous prime is 20980231. The next prime is 20980241. The reversal of 20980240 is 4208902.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 10969344 = 3164^2 + 3312^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×20980240³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20980241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131047 + ... + 131206.

Almost surely, 2^20980240 is an apocalyptic number.

20980240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20980240 is an abundant number, since it is smaller than the sum of its proper divisors (27799004).

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

20980240 is a wasteful number, since it uses less digits than its factorization.

20980240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262266 (or 262260 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20980240 is about 4580.4191947899. The cubic root of 20980240 is about 275.8058566067.

The spelling of 20980240 in words is "twenty million, nine hundred eighty thousand, two hundred forty".