20009960 has 16 divisors (see below), whose sum is σ = 45022500. Its totient is φ = 8003968.

The previous prime is 20009947. The next prime is 20009981. The reversal of 20009960 is 6990002.

It can be written as a sum of positive squares in 2 ways, for example, as 18335524 + 1674436 = 4282^2 + 1294^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250085 + ... + 250164.

Almost surely, 2^20009960 is an apocalyptic number.

20009960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20009960 is an abundant number, since it is smaller than the sum of its proper divisors (25012540).

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

20009960 is a wasteful number, since it uses less digits than its factorization.

20009960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500260 (or 500256 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20009960 is about 4473.2493782484. The cubic root of 20009960 is about 271.4868135141.

Adding to 20009960 its reverse (6990002), we get a palindrome (26999962).

The spelling of 20009960 in words is "twenty million, nine thousand, nine hundred sixty".