20479400 has 24 divisors (see below), whose sum is σ = 47615070. Its totient is φ = 8191680.

The previous prime is 20479399. The next prime is 20479409. The reversal of 20479400 is 497402.

It can be written as a sum of positive squares in 3 ways, for example, as 15665764 + 4813636 = 3958^2 + 2194^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20479400.

It is not an unprimeable number, because it can be changed into a prime (20479409) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 50999 + ... + 51398.

Almost surely, 2^20479400 is an apocalyptic number.

20479400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20479400 is an abundant number, since it is smaller than the sum of its proper divisors (27135670).

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

20479400 is a wasteful number, since it uses less digits than its factorization.

20479400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102413 (or 102404 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20479400 is about 4525.4171078476. The cubic root of 20479400 is about 273.5934796048.

The spelling of 20479400 in words is "twenty million, four hundred seventy-nine thousand, four hundred".