20479790 has 16 divisors (see below), whose sum is σ = 37279440. Its totient is φ = 8099520.

The previous prime is 20479751. The next prime is 20479793. The reversal of 20479790 is 9797402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10616 + ... + 12395.

It is an arithmetic number, because the mean of its divisors is an integer number (2329965).

Almost surely, 2^20479790 is an apocalyptic number.

20479790 is a deficient number, since it is larger than the sum of its proper divisors (16799650).

20479790 is a wasteful number, since it uses less digits than its factorization.

20479790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23107.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20479790 is about 4525.4601975932. The cubic root of 20479790 is about 273.5952163220.

The spelling of 20479790 in words is "twenty million, four hundred seventy-nine thousand, seven hundred ninety".