20404740 has 24 divisors (see below), whose sum is σ = 57133440. Its totient is φ = 5441248.

The previous prime is 20404739. The next prime is 20404753. The reversal of 20404740 is 4740402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169980 + ... + 170099.

It is an arithmetic number, because the mean of its divisors is an integer number (2380560).

Almost surely, 2^20404740 is an apocalyptic number.

20404740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404740 is an abundant number, since it is smaller than the sum of its proper divisors (36728700).

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

20404740 is a wasteful number, since it uses less digits than its factorization.

20404740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340091 (or 340089 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20404740 is about 4517.1606125973. The cubic root of 20404740 is about 273.2606026332.

The spelling of 20404740 in words is "twenty million, four hundred four thousand, seven hundred forty".