20407960 has 16 divisors (see below), whose sum is σ = 45918000. Its totient is φ = 8163168.

The previous prime is 20407921. The next prime is 20407987. The reversal of 20407960 is 6970402.

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 3 ways as a sum of consecutive naturals, for example, 255060 + ... + 255139.

It is an arithmetic number, because the mean of its divisors is an integer number (2869875).

Almost surely, 2^20407960 is an apocalyptic number.

20407960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20407960 is an abundant number, since it is smaller than the sum of its proper divisors (25510040).

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

20407960 is a wasteful number, since it uses less digits than its factorization.

20407960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510210 (or 510206 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20407960 is about 4517.5170171235. The cubic root of 20407960 is about 273.2749759743.

It can be divided in two parts, 2040 and 7960, that added together give a 4-th power (10000 = 10⁴).

The spelling of 20407960 in words is "twenty million, four hundred seven thousand, nine hundred sixty".