20475479 has 4 divisors (see below), whose sum is σ = 21181560. Its totient is φ = 19769400.

The previous prime is 20475383. The next prime is 20475491. The reversal of 20475479 is 97457402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20475479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352997 + ... + 353054.

It is an arithmetic number, because the mean of its divisors is an integer number (5295390).

Almost surely, 2^20475479 is an apocalyptic number.

20475479 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20475479 is a deficient number, since it is larger than the sum of its proper divisors (706081).

20475479 is an equidigital number, since it uses as much as digits as its factorization.

20475479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706080.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 20475479 is about 4524.9838673746. The cubic root of 20475479 is about 273.5760176917.

The spelling of 20475479 in words is "twenty million, four hundred seventy-five thousand, four hundred seventy-nine".