20479764 has 24 divisors (see below), whose sum is σ = 50597568. Its totient is φ = 6424960.

The previous prime is 20479751. The next prime is 20479793. The reversal of 20479764 is 46797402.

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 7 ways as a sum of consecutive naturals, for example, 49992 + ... + 50399.

It is an arithmetic number, because the mean of its divisors is an integer number (2108232).

Almost surely, 2^20479764 is an apocalyptic number.

It is an amenable number.

20479764 is an abundant number, since it is smaller than the sum of its proper divisors (30117804).

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

20479764 is a wasteful number, since it uses less digits than its factorization.

20479764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100415 (or 100413 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 20479764 is about 4525.4573249562. The cubic root of 20479764 is about 273.5951005415.

It can be divided in two parts, 2047 and 9764, that added together give a palindrome (11811).

The spelling of 20479764 in words is "twenty million, four hundred seventy-nine thousand, seven hundred sixty-four".