20580479 has 4 divisors (see below), whose sum is σ = 20728680. Its totient is φ = 20432280.

The previous prime is 20580463. The next prime is 20580481. The reversal of 20580479 is 97408502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20580479 - 2⁴ = 20580463 is a prime.

It is a super-2 number, since 2×20580479² = 847112231738882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20580409) 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 3 ways as a sum of consecutive naturals, for example, 73892 + ... + 74169.

It is an arithmetic number, because the mean of its divisors is an integer number (5182170).

Almost surely, 2^20580479 is an apocalyptic number.

20580479 is a deficient number, since it is larger than the sum of its proper divisors (148201).

20580479 is a wasteful number, since it uses less digits than its factorization.

20580479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148200.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20580479 is about 4536.5712823673. The cubic root of 20580479 is about 274.0428609669.

The spelling of 20580479 in words is "twenty million, five hundred eighty thousand, four hundred seventy-nine".