20479345 has 8 divisors (see below), whose sum is σ = 24851880. Its totient is φ = 16199040.

The previous prime is 20479343. The next prime is 20479363. The reversal of 20479345 is 54397402.

It can be written as a sum of positive squares in 4 ways, for example, as 4343056 + 16136289 = 2084^2 + 4017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20479345 - 2¹ = 20479343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20479345.

It is not an unprimeable number, because it can be changed into a prime (20479343) 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, 22566 + ... + 23455.

It is an arithmetic number, because the mean of its divisors is an integer number (3106485).

Almost surely, 2^20479345 is an apocalyptic number.

It is an amenable number.

20479345 is a deficient number, since it is larger than the sum of its proper divisors (4372535).

20479345 is an equidigital number, since it uses as much as digits as its factorization.

20479345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46115.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20479345 is about 4525.4110310556. The cubic root of 20479345 is about 273.5932346813.

The spelling of 20479345 in words is "twenty million, four hundred seventy-nine thousand, three hundred forty-five".