20408870 has 32 divisors (see below), whose sum is σ = 37836288. Its totient is φ = 7923168.

The previous prime is 20408863. The next prime is 20408893. The reversal of 20408870 is 7880402.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 55427 + ... + 55793.

It is an arithmetic number, because the mean of its divisors is an integer number (1182384).

Almost surely, 2^20408870 is an apocalyptic number.

20408870 is a deficient number, since it is larger than the sum of its proper divisors (17427418).

20408870 is a wasteful number, since it uses less digits than its factorization.

20408870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20408870 is about 4517.6177350458. The cubic root of 20408870 is about 273.2790377314.

The spelling of 20408870 in words is "twenty million, four hundred eight thousand, eight hundred seventy".